Compare 669 vs 681
| Property | 669 | 681 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 31 × 2231 | 31 × 2271 |
| Prime factorization | 3 × 223 | 3 × 227 |
| Divisors count | 4 | 4 |
| Divisors | 1, 3, 223, 669 | 1, 3, 227, 681 |
| Number of properties | 1 | 1 |
| Semiprimes | 200th | 204th |
| Roman numberals | DCLXIX | DCLXXXI |
| Base 2 | 10100111012 | 10101010012 |
| Base 3 | 2202103 | 2210203 |
| Base 4 | 221314 | 222214 |
| Base 5 | 101345 | 102115 |
| Base 6 | 30336 | 30536 |
| Base 7 | 16447 | 16627 |
| Base 8 | 12358 | 12518 |
| Base 9 | 8239 | 8369 |
| Base 10 | 66910 | 68110 |
| Base 11 | 55911 | 56a11 |
| Base 12 | 47912 | 48912 |
| Base 13 | 3c613 | 40513 |
| Base 14 | 35b14 | 36914 |
| Base 15 | 2e915 | 30615 |
| Base 16 | 29d16 | 2a916 |