Compare 491 vs 809
| Property | 491 | 809 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 4911 | 8091 |
| Prime factorization | 491 | 809 |
| Divisors count | 2 | 2 |
| Divisors | 1, 491 | 1, 809 |
| Number of properties | 7 | 7 |
| Additive primes | 74th | |
| Chen primes | 66th | 95th |
| Cousin primes (2nd member) | 26th | |
| Good primes | 39th | |
| Harmonic primes | 38th | |
| Isolated primes | 47th | |
| Long primes | 34th | |
| Primes | 94th | 140th |
| Pythagorean primes | 68th | |
| Sophie germain primes | 25th | 35th |
| Twin primes (1st member) | 31st | |
| Roman numberals | CDXCI | DCCCIX |
| Base 2 | 1111010112 | 11001010012 |
| Base 3 | 2000123 | 10022223 |
| Base 4 | 132234 | 302214 |
| Base 5 | 34315 | 112145 |
| Base 6 | 21356 | 34256 |
| Base 7 | 13017 | 22347 |
| Base 8 | 7538 | 14518 |
| Base 9 | 6059 | 10889 |
| Base 10 | 49110 | 80910 |
| Base 11 | 40711 | 67611 |
| Base 12 | 34b12 | 57512 |
| Base 13 | 2ba13 | 4a313 |
| Base 14 | 27114 | 41b14 |
| Base 15 | 22b15 | 38e15 |
| Base 16 | 1eb16 | 32916 |