Compare 491 vs 521
| Property | 491 | 521 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 4911 | 5211 |
| Prime factorization | 491 | 521 |
| Divisors count | 2 | 2 |
| Divisors | 1, 491 | 1, 521 |
| Number of properties | 7 | 6 |
| Chen primes | 66th | 70th |
| Cousin primes (2nd member) | 26th | |
| Harmonic primes | 38th | |
| Isolated primes | 47th | |
| Long primes | 34th | |
| Lucas primes | 8th | |
| Primes | 94th | 98th |
| Pythagorean primes | 46th | |
| Solinas primes | 39th | |
| Sophie germain primes | 25th | |
| Twin primes (1st member) | 25th | |
| Roman numberals | CDXCI | DXXI |
| Base 2 | 1111010112 | 10000010012 |
| Base 3 | 2000123 | 2010223 |
| Base 4 | 132234 | 200214 |
| Base 5 | 34315 | 40415 |
| Base 6 | 21356 | 22256 |
| Base 7 | 13017 | 13437 |
| Base 8 | 7538 | 10118 |
| Base 9 | 6059 | 6389 |
| Base 10 | 49110 | 52110 |
| Base 11 | 40711 | 43411 |
| Base 12 | 34b12 | 37512 |
| Base 13 | 2ba13 | 31113 |
| Base 14 | 27114 | 29314 |
| Base 15 | 22b15 | 24b15 |
| Base 16 | 1eb16 | 20916 |