Compare 481 vs 491
| Property | 481 | 491 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 131 × 371 | 4911 |
| Prime factorization | 13 × 37 | 491 |
| Divisors count | 4 | 2 |
| Divisors | 1, 13, 37, 481 | 1, 491 |
| Number of properties | 1 | 7 |
| Chen primes | 66th | |
| Cousin primes (2nd member) | 26th | |
| Harmonic primes | 38th | |
| Isolated primes | 47th | |
| Long primes | 34th | |
| Primes | 94th | |
| Semiprimes | 148th | |
| Sophie germain primes | 25th | |
| Roman numberals | CDLXXXI | CDXCI |
| Base 2 | 1111000012 | 1111010112 |
| Base 3 | 1222113 | 2000123 |
| Base 4 | 132014 | 132234 |
| Base 5 | 34115 | 34315 |
| Base 6 | 21216 | 21356 |
| Base 7 | 12557 | 13017 |
| Base 8 | 7418 | 7538 |
| Base 9 | 5849 | 6059 |
| Base 10 | 48110 | 49110 |
| Base 11 | 3a811 | 40711 |
| Base 12 | 34112 | 34b12 |
| Base 13 | 2b013 | 2ba13 |
| Base 14 | 26514 | 27114 |
| Base 15 | 22115 | 22b15 |
| Base 16 | 1e116 | 1eb16 |