Compare 643 vs 997
| Property | 643 | 997 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 6431 | 9971 |
| Prime factorization | 643 | 997 |
| Divisors count | 2 | 2 |
| Divisors | 1, 643 | 1, 997 |
| Number of properties | 7 | 6 |
| Additive primes | 63rd | |
| Cousin primes (1st member) | 29th | |
| Isolated primes | 99th | |
| Left-truncatable primes | 38th | 54th |
| Lucky primes | 33rd | 43rd |
| Primes | 117th | 168th |
| Prime triplets (2nd member) | 24th | |
| Pythagorean primes | 80th | |
| Sexy primes (2nd member) | 74th | |
| Twin primes (2nd member) | 29th | |
| Roman numberals | DCXLIII | CMXCVII |
| Base 2 | 10100000112 | 11111001012 |
| Base 3 | 2122113 | 11002213 |
| Base 4 | 220034 | 332114 |
| Base 5 | 100335 | 124425 |
| Base 6 | 25516 | 43416 |
| Base 7 | 16067 | 26237 |
| Base 8 | 12038 | 17458 |
| Base 9 | 7849 | 13279 |
| Base 10 | 64310 | 99710 |
| Base 11 | 53511 | 82711 |
| Base 12 | 45712 | 6b112 |
| Base 13 | 3a613 | 5b913 |
| Base 14 | 33d14 | 51314 |
| Base 15 | 2cd15 | 46715 |
| Base 16 | 28316 | 3e516 |