Number reference
97 explained.
97: ninety-seven, prime; factors, prime factorization, roots, binary, hexadecimal, and digit properties.
Identity and representations
- Written form
- ninety-seven
- Classification
- prime
- Factors
- 1, 97
- Prime factorization
- 97
- Square root
- 9.848858
- Cube root
- 4.594701
- Binary
- 1100001
- Octal
- 141
- Hexadecimal
- 61
- Roman numeral
- XCVII
- Digit sum
- 16
- Digital root
- 7
What makes 97 notable
- Prime. 97 is prime: it has exactly two divisors, 1 and itself, so it cannot be split into equal whole-number groups any other way.
97 in everyday use
Ninety-seven is the atomic number of berkelium, made at the University of California, Berkeley, in 1949 and named for the city. Normal body temperature in Fahrenheit is often quoted as 98.6, but large modern surveys put the average closer to 97.9. In the ASCII character set, code 97 is the lower-case letter a, the start of the lower-case alphabet.
Ninety-seven is the 25th prime and the largest two-digit prime; 98 and 99 are both composite. It is an emirp with 79, a sum of two squares, 81 + 16, and a Proth prime, 3 × 2⁵ + 1. It is a full-reptend prime, so 1/97 repeats only after 96 digits. In binary it is 1100001.
Nearby numbers
How to read this page
Because 97 is prime, the factor list stops at 1 and 97 itself, so it cannot be shared into equal whole-number groups. That is also what makes it useful as a building block: every larger number with 97 in its prime factorisation inherits it from here.
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