97 (number)

97 (ninety-seven) is the natural number following 96 and preceding 98.

← 96 98 → 97
← 90 91 92 93 94 95 96 97 98 99 → List of numbers — Integers 0 10 20 30 40 50 60 70 80 90 →
Cardinal	ninety-seven
Ordinal	97th (ninety-seventh)
Numeral system	97
Factorization	Prime p25
Divisors	1, 97
Roman numeral	XCVII
Binary	11000012
Octal	1418
Duodecimal	8112
Hexadecimal	6116

In mathematics

97 is the 25th prime number (the largest two-digit prime number in base 10), following 89 and preceding 101. 97 is a Proth prime as it is 3 × 2⁵ + 1.

The numbers 97, 907, 9007, 90007 and 900007 are happy primes. However, 9000007 (read as nine million seven) is composite and has the factorisation 277 × 32491.

97 is the tenth member of the Mian–Chowla sequence.

97 is the smallest factor of one more than the product of the first twenty-five terms of the Euclid–Mullin sequence, making it the twenty-sixth term.

Since there is no integer that added to its own digits adds up to 97, 97 is a self number in base 10.

In astronomy

• Messier object M97, a magnitude 12.0 planetary nebula in the constellation Ursa Major, also known as the Owl Nebula
• The New General Catalogue object NGC 97, an elliptical galaxy in the constellation Andromeda
• The Saros number of
  • the solar eclipse series which began on 123 June and ended on 1385 July. The duration of Saros series 97 was 1262.1 years, and it contained 71 solar eclipses.
  • the lunar eclipse series which began on 425 March and ended on 1723 May. The duration of Saros series 97 was 1298.1 years, and it contained 73 lunar eclipses.

In other fields

Ninety-seven is:

• The year AD 97, 97 BC, or 1997.
• The atomic number of berkelium, an actinide.
• The number of different characters that can be used with a standard English Keyboard.
• The number of leap days that the Gregorian calendar contains in its cycle of 400 years. ⁹⁷⁄₄₀₀ is close to the fraction of a day by which an average tropical year exceeds 365 days, so with this proportion of leap years, the calendar does not accumulate seasonal drift of a full day until after more than 3000 years.
• The designation of Interstate 97, a freeway in Maryland, the shortest Interstate freeway in the continental United States
• British Columbia Highway 97 is the longest continuously-numbered route in the province, from the Canada/U.S. border at Osoyoos to the British Columbia/Yukon border
• U.S. Route 97 is a United States highway from Weed, California, to Okanogon County, Washington
• OC Transpo Route 97, A Transitway bus route in Ottawa, Ontario
• The 97th United States Congress met during the Ronald Reagan administration, from January 1981 to January 1983
• The 10-97 police code means "arrived on the scene"
• STS-97 Space Shuttle Endeavour mission launched November 30, 2000
• The 97th Infantry Division was a unit of the United States Army in World War I and World War II.
• Madden NFL 97 was the first John Madden NFL American football game to be created in the 32-bit gaming era.
• 97 percent of the Earth's salt water is located in oceans and seas.
• 97 radio stations, such as Hot 97, New York City and 97X, Tampa, Florida

In music

• A song Baby Boy / Saturday Night '97 by Whigfield
• The number of the Southern Railway `train in the Wreck of the Old 97, a ballad recorded by numerous artists, including Flatt and Scruggs, Woody Guthrie, Johnny Cash, Nine Pound Hammer, and Hank Snow.
• The Old 97's are an alt-country band, which took their name from the song "The Wreck of the Old 97"
• A song by Alkaline Trio off their self titled album
• The Marching 97, marching band of Lehigh University.

In sports

• The car number of Kurt Busch's Ford when he won the 2004 NASCAR Nextel Cup Series championship.
• Don Larsen pitched a perfect game in Game 5 of the 1956 World Series on October 8, 1956. He threw a total 97 pitches

See also

• List of Highways Numbered 97