173 (number)

← 172 173 174 →
← 170 171 172 173 174 175 176 177 178 179 → List of numbers — Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	one hundred seventy-three
Ordinal	173rd (one hundred and seventy-third)
Factorization	prime
Prime	40th
Divisors	1, 173
Roman numeral	CLXXIII
Binary	101011012
Ternary	201023
Quaternary	22314
Quinary	11435
Senary	4456
Octal	2558
Duodecimal	12512
Hexadecimal	AD16
Vigesimal	8D20
Base 36	4T36

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]
• an inconsummate number.^[3]
• the sum of 2 squares: 2² + 13².
• the sum of three consecutive prime numbers: 53 + 59 + 61.
• palindromic in bases 3 (20102₃), 9 (212₉) and 172 (11₁₇₂).

In astronomy

• 173 Ino is a large dark main belt asteroid
• 173P/Mueller is a periodic comet in our solar system
• Arp 173 (VV 296, KPG 439) is a pair of galaxies in the constellation Boötes

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 Surveillance Squadron (Australia) of the Australian Army at Oakey, Queensland
• K-173 Chelyabinsk Russian Oscar class SSGN submarine at the Rybachiy Nuclear Submarine Base in Vilyuchinsk
• USNS Provo (T-AG-173) was a U.S. Navy Phoenix-class auxiliary ship following World War II
• USS Codington (AK-173) was a U.S. Navy Alamosa-class cargo ship during World War II
• USS Eldridge (DE-173) was a U.S. Navy Cannon-class destroyer escort during World War II
• USS Etamin (IX-173) was a U.S. Navy Crater-class cargo ship during World War II
• USS Florence (SP-173) was a U.S. Navy yacht during World War I
• USS Hyde (APA-173) was a U.S. Navy Haskell-classattack transport ship during World War II
• USS PC-472 was a 173-foot (53 m) U.S. Navy submarine chaser during World War II
• USS Pike (SS-173) was a U.S. Navy Porpoise class submarine diesel-electric submarine during World War II
• USS Sproston (DD-173) was a U.S. Navy Wickes class destroyer 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 173 miles (278 km) 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 '90s.

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
• The book "173 Hours in Captivity" (2000)
• 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
• The Number 173

References

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