125 (number)

125 (one hundred [and] twenty-five) is the natural number following 124 and preceding 126.

← 124 125 126 →
← 120 121 122 123 124 125 126 127 128 129 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	one hundred twenty-five
Ordinal	125th (one hundred twenty-fifth)
Factorization	53
Divisors	1, 5, 25, 125
Greek numeral	ΡΚΕ´
Roman numeral	CXXV
Binary	11111012
Ternary	111223
Senary	3256
Octal	1758
Duodecimal	A512
Hexadecimal	7D16

In mathematics

125 is the cube of 5. It can be expressed as a sum of two squares in two different ways, 125 = 10² + 5² = 11² + 2².^[1]

125 and 126 form a Ruth-Aaron pair under the second definition in which repeated prime factors are counted as often as they occur.

Like many other powers of 5, it is a Friedman number in base 10 since 125 = 5^{1 + 2}.

125 is the center of a close triplet of perfect powers, (121 = 11², 125 = 5³, 128 = 2⁷). Excluding the trivial cases of 0 and 1, the only closer such triplet is (4,8,9) and the only other equally close is (25, 27, 32).^[2]

U.S. military

• Air National Guard 125th Special Tactics Squadron unit in Portland, Oregon
• US Air Force 125th Fighter Wing, Air National Guard unit at Jacksonville International Airport, Florida
• US Navy VAW-125 squadron at Naval Station Norfolk, Virginia
• US Navy VFA-125 strike fighter squadron at Naval Air Station Lemoore, California
• USNS Mission San Jose (T-AO-125), a US Navy fleet oiler during World War II
• USS Tide (AM-125), a US Navy minesweeper
• Northrop YC-125 Raider utility transport plane

In transportation

• The Fiat 125 automobile
• Many motorcycle licenses and racing events limit engine capacity to 125cc. Examples of 125cc motorcycles include;
  • The Honda XRM 125 motorcycle
  • The Yamaha YZ125, for motocross
• The Harlem-125th Street (Metro-North) station serving Harlem, New York City
• The InterCity 125, sometimes referred to simply as "one two five", a British high-speed train
• New Jersey Transit bus route 125
• London Buses route 125 is a Transport for London contracted bus route in London
• 125 is the number of many roads, including Mexican Federal Highway 125
• Pan Am Flight 125 from London’s Heathrow Airport to New York's John F. Kennedy International Airport which had pressurization problems on March 10, 1987
• The 125th Street Bridge crosses the Mississippi River in Minnesota
• STS-125, a Space Shuttle Atlantis mission, the final mission to service the Hubble Space Telescope, launched May 11, 2009 at 2:01 pm EDT landed May 24, 2009 at 11:39:05 am EDT
• 125 (dinghy) - a class of sailing dingy popular in Australia.
• EMD F125 locomotive manufactured by Electro Motive Diesel.

In other fields

125 is also:

• The year AD 125 or 125 BC
• 125 AH is a year in the Islamic calendar that corresponds to 742 – 743 CE
• 125 Liberatrix is a Main belt asteroid
• The atomic number of the yet-to-be-discovered element unbipentium
• Sonnet 125 by William Shakespeare
• 125th Street, Manhattan, New York City
  • 125th Street (New York City Subway), multiple subway stations
• CA-125, also known as CA125, is an abbreviation for cancer antigen 125
• 125 High Street is a 30-floor high-rise in Boston
• The highest number of analog cable-ready channels an American television set receives.

See also

• 125th (disambiguation)
• 125th Anniversary of the Confederation of Canada Medal
• 125th Street (disambiguation)
• List of highways numbered 125
• United Nations Security Council Resolution 125

References

1. Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 136
2. Noe, Anthony. "Solutions to Pillai's equation for n <= 100". Retrieved 5 September 2022.