125 (number)

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

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.

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 = 51 + 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).

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.