Compare 645 vs 649
| Property | 645 | 649 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 3 | 2 |
| Total factors | 3 | 2 |
| Prime factorization | 31 × 51 × 431 | 111 × 591 |
| Prime factorization | 3 × 5 × 43 | 11 × 59 |
| Divisors count | 8 | 4 |
| Divisors | 1, 3, 5, 15, 43, 129, 215, 645 | 1, 11, 59, 649 |
| Number of properties | 0 | 1 |
| Semiprimes | 196th | |
| Roman numberals | DCXLV | DCXLIX |
| Base 2 | 10100001012 | 10100010012 |
| Base 3 | 2122203 | 2200013 |
| Base 4 | 220114 | 220214 |
| Base 5 | 100405 | 100445 |
| Base 6 | 25536 | 30016 |
| Base 7 | 16117 | 16157 |
| Base 8 | 12058 | 12118 |
| Base 9 | 7869 | 8019 |
| Base 10 | 64510 | 64910 |
| Base 11 | 53711 | 54011 |
| Base 12 | 45912 | 46112 |
| Base 13 | 3a813 | 3ac13 |
| Base 14 | 34114 | 34514 |
| Base 15 | 2d015 | 2d415 |
| Base 16 | 28516 | 28916 |