Number reference
997 explained.
997: nine hundred ninety-seven, prime; factors, prime factorization, roots, binary, hexadecimal, and digit properties.
Identity and representations
- Written form
- nine hundred ninety-seven
- Classification
- prime
- Factors
- 1, 997
- Prime factorization
- 997
- Square root
- 31.575307
- Cube root
- 9.98999
- Binary
- 1111100101
- Octal
- 1745
- Hexadecimal
- 3E5
- Roman numeral
- CMXCVII
- Digit sum
- 25
- Digital root
- 7
What makes 997 notable
- Prime. 997 is prime: it has exactly two divisors, 1 and itself, so it cannot be split into equal whole-number groups any other way.
997 in everyday use
Nine hundred ninety-seven is the largest prime below one thousand — the last prime you reach counting up through three-digit numbers.
Nearby numbers
How to read this page
Because 997 is prime, the factor list stops at 1 and 997 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 997 in its prime factorisation inherits it from here.
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