Compare 491 vs 497
| Property | 491 | 497 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 4911 | 71 × 711 |
| Prime factorization | 491 | 7 × 71 |
| Divisors count | 2 | 4 |
| Divisors | 1, 491 | 1, 7, 71, 497 |
| Number of properties | 7 | 1 |
| Chen primes | 66th | |
| Cousin primes (2nd member) | 26th | |
| Harmonic primes | 38th | |
| Isolated primes | 47th | |
| Long primes | 34th | |
| Primes | 94th | |
| Semiprimes | 153rd | |
| Sophie germain primes | 25th | |
| Roman numberals | CDXCI | CDXCVII |
| Base 2 | 1111010112 | 1111100012 |
| Base 3 | 2000123 | 2001023 |
| Base 4 | 132234 | 133014 |
| Base 5 | 34315 | 34425 |
| Base 6 | 21356 | 21456 |
| Base 7 | 13017 | 13107 |
| Base 8 | 7538 | 7618 |
| Base 9 | 6059 | 6129 |
| Base 10 | 49110 | 49710 |
| Base 11 | 40711 | 41211 |
| Base 12 | 34b12 | 35512 |
| Base 13 | 2ba13 | 2c313 |
| Base 14 | 27114 | 27714 |
| Base 15 | 22b15 | 23215 |
| Base 16 | 1eb16 | 1f116 |