Compare 491 vs 509
| Property | 491 | 509 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 4911 | 5091 |
| Prime factorization | 491 | 509 |
| Divisors count | 2 | 2 |
| Divisors | 1, 491 | 1, 509 |
| Number of properties | 7 | 9 |
| Chen primes | 66th | 69th |
| Cousin primes (2nd member) | 26th | |
| Harmonic primes | 38th | |
| Isolated primes | 47th | 50th |
| Long primes | 34th | 37th |
| Primes | 94th | 97th |
| Pythagorean primes | 45th | |
| Sexy primes (2nd member) | 47th | |
| Solinas primes | 38th | |
| Sophie germain primes | 25th | 26th |
| Super primes | 25th | |
| Roman numberals | CDXCI | DIX |
| Base 2 | 1111010112 | 1111111012 |
| Base 3 | 2000123 | 2002123 |
| Base 4 | 132234 | 133314 |
| Base 5 | 34315 | 40145 |
| Base 6 | 21356 | 22056 |
| Base 7 | 13017 | 13257 |
| Base 8 | 7538 | 7758 |
| Base 9 | 6059 | 6259 |
| Base 10 | 49110 | 50910 |
| Base 11 | 40711 | 42311 |
| Base 12 | 34b12 | 36512 |
| Base 13 | 2ba13 | 30213 |
| Base 14 | 27114 | 28514 |
| Base 15 | 22b15 | 23e15 |
| Base 16 | 1eb16 | 1fd16 |