Compare 681 vs 687
| Property | 681 | 687 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 31 × 2271 | 31 × 2291 |
| Prime factorization | 3 × 227 | 3 × 229 |
| Divisors count | 4 | 4 |
| Divisors | 1, 3, 227, 681 | 1, 3, 229, 687 |
| Number of properties | 1 | 1 |
| Semiprimes | 204th | 206th |
| Roman numberals | DCLXXXI | DCLXXXVII |
| Base 2 | 10101010012 | 10101011112 |
| Base 3 | 2210203 | 2211103 |
| Base 4 | 222214 | 222334 |
| Base 5 | 102115 | 102225 |
| Base 6 | 30536 | 31036 |
| Base 7 | 16627 | 20017 |
| Base 8 | 12518 | 12578 |
| Base 9 | 8369 | 8439 |
| Base 10 | 68110 | 68710 |
| Base 11 | 56a11 | 57511 |
| Base 12 | 48912 | 49312 |
| Base 13 | 40513 | 40b13 |
| Base 14 | 36914 | 37114 |
| Base 15 | 30615 | 30c15 |
| Base 16 | 2a916 | 2af16 |