Compare 491 vs 501
| Property | 491 | 501 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 4911 | 31 × 1671 |
| Prime factorization | 491 | 3 × 167 |
| Divisors count | 2 | 4 |
| Divisors | 1, 491 | 1, 3, 167, 501 |
| 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 | 154th | |
| Sophie germain primes | 25th | |
| Roman numberals | CDXCI | DI |
| Base 2 | 1111010112 | 1111101012 |
| Base 3 | 2000123 | 2001203 |
| Base 4 | 132234 | 133114 |
| Base 5 | 34315 | 40015 |
| Base 6 | 21356 | 21536 |
| Base 7 | 13017 | 13147 |
| Base 8 | 7538 | 7658 |
| Base 9 | 6059 | 6169 |
| Base 10 | 49110 | 50110 |
| Base 11 | 40711 | 41611 |
| Base 12 | 34b12 | 35912 |
| Base 13 | 2ba13 | 2c713 |
| Base 14 | 27114 | 27b14 |
| Base 15 | 22b15 | 23615 |
| Base 16 | 1eb16 | 1f516 |