Compare 490 vs 491
| Property | 490 | 491 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 4 | 1 |
| Prime factorization | 21 × 51 × 72 | 4911 |
| Prime factorization | 2 × 5 × 7 × 7 | 491 |
| Divisors count | 12 | 2 |
| Divisors | 1, 2, 5, 7, 10, 14, 35, 49, 70, 98, 245, 490 | 1, 491 |
| Number of properties | 0 | 7 |
| Chen primes | 66th | |
| Cousin primes (2nd member) | 26th | |
| Harmonic primes | 38th | |
| Isolated primes | 47th | |
| Long primes | 34th | |
| Primes | 94th | |
| Sophie germain primes | 25th | |
| Roman numberals | CDXC | CDXCI |
| Base 2 | 1111010102 | 1111010112 |
| Base 3 | 2000113 | 2000123 |
| Base 4 | 132224 | 132234 |
| Base 5 | 34305 | 34315 |
| Base 6 | 21346 | 21356 |
| Base 7 | 13007 | 13017 |
| Base 8 | 7528 | 7538 |
| Base 9 | 6049 | 6059 |
| Base 10 | 49010 | 49110 |
| Base 11 | 40611 | 40711 |
| Base 12 | 34a12 | 34b12 |
| Base 13 | 2b913 | 2ba13 |
| Base 14 | 27014 | 27114 |
| Base 15 | 22a15 | 22b15 |
| Base 16 | 1ea16 | 1eb16 |