Compare 681 vs 683
| Property | 681 | 683 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 31 × 2271 | 6831 |
| Prime factorization | 3 × 227 | 683 |
| Divisors count | 4 | 2 |
| Divisors | 1, 3, 227, 681 | 1, 683 |
| Number of properties | 1 | 10 |
| Additive primes | 66th | |
| Chen primes | 86th | |
| Happy primes | 28th | |
| Harmonic primes | 49th | |
| Isolated primes | 65th | |
| Left-truncatable primes | 42nd | |
| Primes | 124th | |
| Semiprimes | 204th | |
| Sexy primes (2nd member) | 60th | |
| Sophie germain primes | 31st | |
| Wagstaff primes | 4th | |
| Roman numberals | DCLXXXI | DCLXXXIII |
| Base 2 | 10101010012 | 10101010112 |
| Base 3 | 2210203 | 2210223 |
| Base 4 | 222214 | 222234 |
| Base 5 | 102115 | 102135 |
| Base 6 | 30536 | 30556 |
| Base 7 | 16627 | 16647 |
| Base 8 | 12518 | 12538 |
| Base 9 | 8369 | 8389 |
| Base 10 | 68110 | 68310 |
| Base 11 | 56a11 | 57111 |
| Base 12 | 48912 | 48b12 |
| Base 13 | 40513 | 40713 |
| Base 14 | 36914 | 36b14 |
| Base 15 | 30615 | 30815 |
| Base 16 | 2a916 | 2ab16 |