Compare 1997 vs 2006
| Property | 1997 | 2006 | 
|---|---|---|
| Type | prime | composite number | 
| Unique factors | 1 | 3 | 
| Total factors | 1 | 3 | 
| Prime factorization | 19971 | 21 × 171 × 591 | 
| Prime factorization | 1997 | 2 × 17 × 59 | 
| Divisors count | 2 | 8 | 
| Divisors | 1, 1997 | 1, 2, 17, 34, 59, 118, 1003, 2006 | 
| 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 | MMVI | 
| Base 2 | 111110011012 | 111110101102 | 
| Base 3 | 22012223 | 22020223 | 
| Base 4 | 1330314 | 1331124 | 
| Base 5 | 304425 | 310115 | 
| Base 6 | 131256 | 131426 | 
| Base 7 | 55527 | 55647 | 
| Base 8 | 37158 | 37268 | 
| Base 9 | 26589 | 26689 | 
| Base 10 | 199710 | 200610 | 
| Base 11 | 155611 | 156411 | 
| Base 12 | 11a512 | 11b212 | 
| Base 13 | ba813 | bb413 | 
| Base 14 | a2914 | a3414 | 
| Base 15 | 8d215 | 8db15 | 
| Base 16 | 7cd16 | 7d616 |