| Number: | 11 |
| Factorization: | prime |
| Prime: | 5th |
| Divisor: | 1, 11 |
| Greek Prefix: | hendeca-/hendeka- |
| Latin Prefix: | undeca- |
| Lang1: | Bangla |
| Lang1 Symbol: | Telugu: ১১ |
| Lang2: | Hebrew numeral |
| Lang2 Symbol: | י"א |
| Lang3: | Devanagari numerals |
| Lang3 Symbol: | Hindi: ११ |
| Lang4: | Malayalam |
| Lang4 Symbol: | Malayalam: ൰൧ |
| Lang5: | Tamil numerals |
| Lang5 Symbol: | Tamil: கக |
| Lang6: | Telugu |
| Lang6 Symbol: | Telugu: ౧౧ |
| Lang8: | Babylonian numeral |
| Numeral: | undecimal |
11 (eleven) is the natural number following 10 and preceding 12. In English, it is the smallest positive integer whose name has three syllables.
"Eleven" derives from the Old English English, Old (ca.450-1100);: ęndleofon, which is first attested in Bede's late 9th-century Ecclesiastical History of the English People. It has cognates in every Germanic language (for example, German German: elf), whose Proto-Germanic ancestor has been reconstructed as Germanic languages: *ainalifa-,[1] from the prefix Germanic languages: *aina- (adjectival "one") and suffix Germanic languages: *-lifa-, of uncertain meaning. It is sometimes compared with the Lithuanian Lithuanian: vienúolika, though Lithuanian: -lika is used as the suffix for all numbers from 11 to 19 (analogously to "-teen").
The Old English form has closer cognates in Old Frisian, Saxon, and Norse, whose ancestor has been reconstructed as Germanic languages: *ainlifun. This was formerly thought to be derived from Proto-Germanic Germanic languages: *tehun ("ten");[2] it is now sometimes connected with Germanic languages: *leikʷ- or Germanic languages: *leip- ("left; remaining"), with the implicit meaning that "one is left" after counting to ten.[3]
11 is a prime number, and a super-prime. 11 forms a twin prime with 13,[4] and sexy pair with 5 and 17.
The first prime exponent that does not yield a Mersenne prime is 11.
11 is part of a pair of Brown numbers. Only three such pairs of numbers are known. Rows in Pascal's triangle can be seen as representation of powers of 11.[5]
An 11-sided polygon is called a hendecagon, or undecagon. A regular hendecagon is the polygon with the fewest number of sides that is not able to be constructed with a straightedge, compass, and angle trisector.[6]
M11
7920=24 ⋅ 32 ⋅ 5 ⋅ 11=8 ⋅ 9 ⋅ 10 ⋅ 11
M11
M12
| Division | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 11 ÷ x | 11 | 5.5 | 3. | 2.75 | 2.2 | 1.8 | 1. | 1.375 | 1. | 1.1 | 1 | 0.91 | 0. | 0.7 | 0.7 | |
| x ÷ 11 | 0. | 0. | 0. | 0. | 0. | 0. | 0. | 0. | 0. | 0. | 1 | 1. | 1. | 1. | 1. |
| Exponentiation | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 11 | 11 | 121 | 1331 | 14641 | 161051 | 1771561 | 19487171 | 214358881 | 2357947691 | 25937424601 | 285311670611 | |
| x | 1 | 2048 | 177147 | 4194304 | 48828125 | 362797056 | 1977326743 | 8589934592 | 31381059609 | 100000000000 | 285311670611 |
In chemistry, Group 11 of the Periodic Table of the Elements (IUPAC numbering) consists of the three coinage metals copper, silver, and gold known from antiquity, and roentgenium, a recently synthesized superheavy element. 11 is the number of spacetime dimensions in M-theory.
Apollo 11 was the first crewed spacecraft to land on the Moon. In our solar system, the Sun has a sunspot cycle's periodicity that is approximately 11 years.
The interval of an octave plus a fourth is an 11th. A complete 11th chord has almost every note of a diatonic scale.Regarding musical instruments, there are 11 thumb keys on a bassoon, not counting the whisper key. (A few bassoons have a 12th thumb key.)
In sports, there are 11 players on an association football (soccer) team, 11 players on an American football team during play, 11 players on a cricket team on the field, and 11 players in a field hockey team. In the game of blackjack, an ace can count as either one or 11, whichever is more advantageous for the player.
In the mockumentary film This Is Spinal Tap, the idiomatic phrase up to eleven is coined to allude to going beyond the limitations of a system, in this case music amplifier volume levels.
The stylized maple leaf on the Flag of Canada has 11 points. The CA$ one-dollar loonie is in the shape of an 11-sided hendecagon, and clocks depicted on Canadian currency, like the Canadian 50-dollar bill, show 11:00.
Being one hour before 12:00, the eleventh hour means the last possible moment to take care of something, and often implies a situation of urgent danger or emergency (see Doomsday clock). "The eleventh hour" is a phrase in the Parable of the Workers in the Vineyard in the Bible.
While 11 has its own name in Germanic languages such as English, German, or Swedish, and some Latin-based languages such as Spanish, Portuguese, and French, it is the first compound number in many other languages: Chinese Chinese: 十一 Chinese: shí yī, Korean Korean: 열하나 Korean: yeol hana or Korean: 십일 Korean: ship il.
The number 11 (alongside its multiples 22 and 33) are master numbers in numerology, especially in New Age.[7]
Web site: Grimes. James. Eleven. Numberphile. Brady Haran. 2016-01-03. https://web.archive.org/web/20171015073814/http://www.numberphile.com/videos/11.html. 2017-10-15.