Compare 987 vs 997
| Property | 987 | 997 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 31 × 71 × 471 | 9971 |
| Prime factorization | 3 × 7 × 47 | 997 |
| Divisors count | 8 | 2 |
| Divisors | 1, 3, 7, 21, 47, 141, 329, 987 | 1, 997 |
| Number of properties | 0 | 6 |
| Isolated primes | 99th | |
| Left-truncatable primes | 54th | |
| Lucky primes | 43rd | |
| Primes | 168th | |
| Pythagorean primes | 80th | |
| Sexy primes (2nd member) | 74th | |
| Roman numberals | CMLXXXVII | CMXCVII |
| Base 2 | 11110110112 | 11111001012 |
| Base 3 | 11001203 | 11002213 |
| Base 4 | 331234 | 332114 |
| Base 5 | 124225 | 124425 |
| Base 6 | 43236 | 43416 |
| Base 7 | 26107 | 26237 |
| Base 8 | 17338 | 17458 |
| Base 9 | 13169 | 13279 |
| Base 10 | 98710 | 99710 |
| Base 11 | 81811 | 82711 |
| Base 12 | 6a312 | 6b112 |
| Base 13 | 5ac13 | 5b913 |
| Base 14 | 50714 | 51314 |
| Base 15 | 45c15 | 46715 |
| Base 16 | 3db16 | 3e516 |