Compare 1691 vs 1693
| Property | 1691 | 1693 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 191 × 891 | 16931 |
| Prime factorization | 19 × 89 | 1693 |
| Divisors count | 4 | 2 |
| Divisors | 1, 19, 89, 1691 | 1, 1693 |
| Number of properties | 1 | 8 |
| Additive primes | 140th | |
| Cousin primes (1st member) | 60th | |
| Isolated primes | 159th | |
| Lucky primes | 63rd | |
| Primes | 264th | |
| Prime triplets (1st member) | 44th | |
| Pythagorean primes | 127th | |
| Semiprimes | 488th | |
| Sexy primes (1st member) | 114th | |
| Roman numberals | MDCXCI | MDCXCIII |
| Base 2 | 110100110112 | 110100111012 |
| Base 3 | 20221223 | 20222013 |
| Base 4 | 1221234 | 1221314 |
| Base 5 | 232315 | 232335 |
| Base 6 | 114556 | 115016 |
| Base 7 | 46347 | 46367 |
| Base 8 | 32338 | 32358 |
| Base 9 | 22789 | 22819 |
| Base 10 | 169110 | 169310 |
| Base 11 | 12a811 | 12aa11 |
| Base 12 | b8b12 | b9112 |
| Base 13 | a0113 | a0313 |
| Base 14 | 88b14 | 88d14 |
| Base 15 | 77b15 | 77d15 |
| Base 16 | 69b16 | 69d16 |