Compare 680 vs 691
| Property | 680 | 691 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 5 | 1 |
| Prime factorization | 23 × 51 × 171 | 6911 |
| Prime factorization | 2 × 2 × 2 × 5 × 17 | 691 |
| Divisors count | 16 | 2 |
| Divisors | 1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 680 | 1, 691 |
| Number of properties | 0 | 3 |
| Harmonic primes | 50th | |
| Isolated primes | 66th | |
| Primes | 125th | |
| Roman numberals | DCLXXX | DCXCI |
| Base 2 | 10101010002 | 10101100112 |
| Base 3 | 2210123 | 2211213 |
| Base 4 | 222204 | 223034 |
| Base 5 | 102105 | 102315 |
| Base 6 | 30526 | 31116 |
| Base 7 | 16617 | 20057 |
| Base 8 | 12508 | 12638 |
| Base 9 | 8359 | 8479 |
| Base 10 | 68010 | 69110 |
| Base 11 | 56911 | 57911 |
| Base 12 | 48812 | 49712 |
| Base 13 | 40413 | 41213 |
| Base 14 | 36814 | 37514 |
| Base 15 | 30515 | 31115 |
| Base 16 | 2a816 | 2b316 |