Compare 1997 vs 2521
| Property | 1997 | 2521 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 19971 | 25211 |
| Prime factorization | 1997 | 2521 |
| Divisors count | 2 | 2 |
| Divisors | 1, 1997 | 1, 2521 |
| Number of properties | 10 | 6 |
| Centered square primes | 18th | |
| Chen primes | 185th | |
| Cousin primes (2nd member) | 64th | |
| Good primes | 64th | 71st |
| Harmonic primes | 138th | |
| Isolated primes | 226th | |
| Left-truncatable primes | 62nd | |
| Primes | 302nd | 369th |
| Prime triplets (1st member) | 50th | |
| Prime triplets (2nd member) | 49th | |
| Pythagorean primes | 147th | 181st |
| Sexy primes (1st member) | 129th | |
| Twin primes (1st member) | 61st | |
| Roman numberals | MCMXCVII | MMDXXI |
| Base 2 | 111110011012 | 1001110110012 |
| Base 3 | 22012223 | 101101013 |
| Base 4 | 1330314 | 2131214 |
| Base 5 | 304425 | 400415 |
| Base 6 | 131256 | 154016 |
| Base 7 | 55527 | 102317 |
| Base 8 | 37158 | 47318 |
| Base 9 | 26589 | 34119 |
| Base 10 | 199710 | 252110 |
| Base 11 | 155611 | 199211 |
| Base 12 | 11a512 | 156112 |
| Base 13 | ba813 | 11bc13 |
| Base 14 | a2914 | cc114 |
| Base 15 | 8d215 | b3115 |
| Base 16 | 7cd16 | 9d916 |