97 (number)
Encyclopedia : 9 : 97 : 97N : 97 (number)
97 (ninety-seven) is the natural number following 96 and preceding 98.
| Cardinal | 97 ninety-seven |
| Ordinal | 97th ninety-seventh |
| Factorization | [prime] |
| Roman numeral | XCVII |
| Binary | 1100001 |
| Hexadecimal | 61 |
In mathematics
97 is the 25th prime number (and in turn the largest two digit prime number), following 89 and preceding 101. Since there is no integer that added to its own digits adds up to 97, 97 is a self number.
The numbers 97, 907, 9007, 90007 and 900007 are all prime. However, 9000007 (read as nine million and seven) is composite and has the factorisation 277 × 32491.
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 11 and ended on 1385 July 8. 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 20 and ended on 1723 May 20. The duration of Saros series 97 was 1298.1 years, and it contained 73 lunar eclipses.
In other fields
Ninety-seven is:- The atomic number of berkelium, an actinide.
- The number of the Southern Railway train in the Wreck of the Old 97.
- The number of Kurt Busch's NASCAR Ford when he won the 2004 NEXTEL Cup Series championship.
- The designation of Interstate 97, a freeway in Maryland, the shortest Interstate freeway in the continental United States.
- The year AD 97, 97 BC, or 1997.
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