Names of 491
| Nominal | 491 |
| Cardinal | four hundred ninety-one |
| Ordinal | 491st |
| This number as US currency | four hundred ninety-one dollars |
| Is 491 an odd number? | 491 is an odd number |
| Is 491 an even number? | 491 is NOT an even number |
| Is 491 a palindrome? | 491 is NOT a palindrome number |
| Is 491 a triangle number? | 491 is NOT a triangle number |
491 in other Bases
| Base 2 (Binary) | 1111010112 |
| Base 3 (Ternary) | 2000123 |
| Base 4 (Quaternary) | 132234 |
| Base 5 (Quinary) | 34315 |
| Base 6 (Senary) | 21356 |
| Base 8 (Octal) | 7538 |
| Base 12 (Duodecimal) | 34B12 |
| Base 16 (Hexadecimal) | 1EB16 |
| Base 20 (Vigesimal) | 14B20 |
Primes and Factors tests for 491
| Is 491 a Prime Number? | 491 is a prime |
| Is 491 a perfect number? | 491 is NOT a perfect number |
| Is 491 a Mersenne Prime? | 491 is NOT a Mersenne prime |
| Is 491 a Fermat Prime? | 491 is NOT a Fermat prime |
| Is 491 a Fibonacci Prime? | 491 is NOT a Fibonacci prime |
| Is 491 a Partition Prime? | 491 is NOT a Partition prime |
| Is 491 a Pell Prime? | 491 is NOT a Pell prime |
| Prime Factors | Prime factors of 491 |
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491 in other Numerals
| 491 in Roman Numeral | CDXCI |
| 491 in Chinese Numeral | 肆佰玖拾壹 |
| 491 in Egyptian Numeral | 𓍥𓎎𓏺 |
| 491 in Babylonian Numeral |   |
Roots and stuff for 491
| Is 491 a square number? | 491 is NOT a square number |
| Is 491 a cube number? | 491 is NOT a cube number |
| Square root of the number 491 | 22.15851980616 |
| Cube root of the number 491 | 7.8890946040238 |
Recreational math for 491
| Number 491 reversed | 194 |
| Sum of the digits | 14 |
| No of digits | 3 |