Compare 997 vs 998
| Property | 997 | 998 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 9971 | 21 × 4991 |
| Prime factorization | 997 | 2 × 499 |
| Divisors count | 2 | 4 |
| Divisors | 1, 997 | 1, 2, 499, 998 |
| Number of properties | 6 | 1 |
| Isolated primes | 99th | |
| Left-truncatable primes | 54th | |
| Lucky primes | 43rd | |
| Primes | 168th | |
| Pythagorean primes | 80th | |
| Semiprimes | 299th | |
| Sexy primes (2nd member) | 74th | |
| Roman numberals | CMXCVII | CMXCVIII |
| Base 2 | 11111001012 | 11111001102 |
| Base 3 | 11002213 | 11002223 |
| Base 4 | 332114 | 332124 |
| Base 5 | 124425 | 124435 |
| Base 6 | 43416 | 43426 |
| Base 7 | 26237 | 26247 |
| Base 8 | 17458 | 17468 |
| Base 9 | 13279 | 13289 |
| Base 10 | 99710 | 99810 |
| Base 11 | 82711 | 82811 |
| Base 12 | 6b112 | 6b212 |
| Base 13 | 5b913 | 5ba13 |
| Base 14 | 51314 | 51414 |
| Base 15 | 46715 | 46815 |
| Base 16 | 3e516 | 3e616 |