Compare 649 vs 681
| Property | 649 | 681 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 111 × 591 | 31 × 2271 |
| Prime factorization | 11 × 59 | 3 × 227 |
| Divisors count | 4 | 4 |
| Divisors | 1, 11, 59, 649 | 1, 3, 227, 681 |
| Number of properties | 1 | 1 |
| Semiprimes | 196th | 204th |
| Roman numberals | DCXLIX | DCLXXXI |
| Base 2 | 10100010012 | 10101010012 |
| Base 3 | 2200013 | 2210203 |
| Base 4 | 220214 | 222214 |
| Base 5 | 100445 | 102115 |
| Base 6 | 30016 | 30536 |
| Base 7 | 16157 | 16627 |
| Base 8 | 12118 | 12518 |
| Base 9 | 8019 | 8369 |
| Base 10 | 64910 | 68110 |
| Base 11 | 54011 | 56a11 |
| Base 12 | 46112 | 48912 |
| Base 13 | 3ac13 | 40513 |
| Base 14 | 34514 | 36914 |
| Base 15 | 2d415 | 30615 |
| Base 16 | 28916 | 2a916 |