Compare 1997 vs 2007
| Property | 1997 | 2007 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 2 |
| Total factors | 1 | 3 |
| Prime factorization | 19971 | 32 × 2231 |
| Prime factorization | 1997 | 3 × 3 × 223 |
| Divisors count | 2 | 6 |
| Divisors | 1, 1997 | 1, 3, 9, 223, 669, 2007 |
| Number of properties | 10 | 0 |
| Chen primes | 185th | |
| Cousin primes (2nd member) | 64th | |
| Good primes | 64th | |
| Left-truncatable primes | 62nd | |
| Primes | 302nd | |
| Prime triplets (1st member) | 50th | |
| Prime triplets (2nd member) | 49th | |
| Pythagorean primes | 147th | |
| Sexy primes (1st member) | 129th | |
| Twin primes (1st member) | 61st | |
| Roman numberals | MCMXCVII | MMVII |
| Base 2 | 111110011012 | 111110101112 |
| Base 3 | 22012223 | 22021003 |
| Base 4 | 1330314 | 1331134 |
| Base 5 | 304425 | 310125 |
| Base 6 | 131256 | 131436 |
| Base 7 | 55527 | 55657 |
| Base 8 | 37158 | 37278 |
| Base 9 | 26589 | 26709 |
| Base 10 | 199710 | 200710 |
| Base 11 | 155611 | 156511 |
| Base 12 | 11a512 | 11b312 |
| Base 13 | ba813 | bb513 |
| Base 14 | a2914 | a3514 |
| Base 15 | 8d215 | 8dc15 |
| Base 16 | 7cd16 | 7d716 |