Compare 646 vs 649
| Property | 646 | 649 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 3 | 2 |
| Total factors | 3 | 2 |
| Prime factorization | 21 × 171 × 191 | 111 × 591 |
| Prime factorization | 2 × 17 × 19 | 11 × 59 |
| Divisors count | 8 | 4 |
| Divisors | 1, 2, 17, 19, 34, 38, 323, 646 | 1, 11, 59, 649 |
| Number of properties | 0 | 1 |
| Semiprimes | 196th | |
| Roman numberals | DCXLVI | DCXLIX |
| Base 2 | 10100001102 | 10100010012 |
| Base 3 | 2122213 | 2200013 |
| Base 4 | 220124 | 220214 |
| Base 5 | 100415 | 100445 |
| Base 6 | 25546 | 30016 |
| Base 7 | 16127 | 16157 |
| Base 8 | 12068 | 12118 |
| Base 9 | 7879 | 8019 |
| Base 10 | 64610 | 64910 |
| Base 11 | 53811 | 54011 |
| Base 12 | 45a12 | 46112 |
| Base 13 | 3a913 | 3ac13 |
| Base 14 | 34214 | 34514 |
| Base 15 | 2d115 | 2d415 |
| Base 16 | 28616 | 28916 |