173 (number) explained

Number:	173
Factorization:	prime
Prime:	40th
Divisor:	1, 173

173 (one hundred [and] seventy-three) is the natural number following 172 and preceding 174.

In mathematics

173 is:

• an odd number.
• a deficient number.
• an odious number.
• a balanced prime.^[1]
• an Eisenstein prime with no imaginary part.
• a Sophie Germain prime.^[2]
• a Pythagorean prime
• a Higgs prime
• an Isolated Prime
• a Regular Prime
• a Sexy Prime
• a Truncatable Prime
• an inconsummate number.^[3]
• the sum of 2 squares: 2² + 13².
• the sum of three consecutive prime numbers: 53 + 59 + 61.
• Palindromic number in bases 3 (20102₃) and 9 (212₉).
• the 40th prime number following 167 and preceding 179.

In astronomy

• 173 Ino is a large dark main belt asteroid
• 173P/Mueller is a periodic comet in the Solar System
• Arp 173 (VV 296, KPG 439) is a pair of galaxies in the constellation Boötes
• Kosmos 173 was a soviet union satellite
• NGC 173 is an unbarred spiral galaxy

In the military

• 173rd Air Refueling Squadron unit of the Nebraska Air National Guard
• 173rd Airborne Brigade Combat Team of the United States Army based in Vicenza
• 173rd Battalion unit of the Canadian Expeditionary Force during the World War I
• 173rd Special Operations Aviation Squadron of the Australian Army
  • K-173 Chelyabinsk Russian was a U.S. Navy Phoenix-class auxiliary ship following World War II
• was a U.S. Navy during World War II
• was a U.S. Navy during World War II
• was a U.S. Navy during World War II
• was a U.S. Navy yacht during World War I
• was a U.S. Navy ship during World War II
• was a 173feet U.S. Navy submarine chaser during World War II
• was a U.S. Navy Porpoise-class submarine during World War II
• was a U.S. Navy following World War II
• Vought V-173 (Flying Pancake) was a U.S. Navy experimental test aircraft during World War II

In transportation

• The Georgia Railroad, the world longest railroad in 1845, ran for 173miles from Augusta to Marthasville (Atlanta, Georgia)
• United Airlines Flight 173 en route from Denver to Portland crashed on December 28, 1978
• The Velocity 173 was a kit aircraft produced by Velocity Aircraft in the early 1990s.

In popular culture

• The book 173 Hours in Captivity (2000)
• SCP-173, a fictional statue

In other fields

173 is also:

• The year AD 173 or 173 BC
• 173 AH is a year in the Islamic calendar that corresponds to 789  - 790 CE
• The atomic number of an element temporarily called unsepttrium
• Topic of discussion during the podcast "Skeptics with a K" episode 180 ^[4]

See also

• List of highways numbered 173
• United Nations Security Council Resolution 173
• United States Supreme Court cases, Volume 173

External links

• Number Facts and Trivia: 173
• Prime curiosities: 173
• Number Gossip: 173

Notes and References

1. Web site: Sloane's A006562 : Balanced primes. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. 2016-05-26.
2. Web site: Sloane's A005384 : Sophie Germain primes. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. 2016-05-26.
3. Web site: Sloane's A003635 : Inconsummate numbers in base 10. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. 2016-05-26.
4. Skeptics with a K: Episode #180 . www.merseysideskeptics.org.uk/podcasts/ . . Michael Marshall . August 25, 2016 . 0:59:15-1:01:30 . 15 November 2016 .