Compare 1989 vs 1999
| Property | 1989 | 1999 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 4 | 1 |
| Prime factorization | 32 × 131 × 171 | 19991 |
| Prime factorization | 3 × 3 × 13 × 17 | 1999 |
| Divisors count | 12 | 2 |
| Divisors | 1, 3, 9, 13, 17, 39, 51, 117, 153, 221, 663, 1989 | 1, 1999 |
| Number of properties | 0 | 8 |
| Centered triangular primes | 10th | |
| Cousin primes (1st member) | 65th | |
| Primes | 303rd | |
| Prime triplets (2nd member) | 50th | |
| Prime triplets (3rd member) | 49th | |
| Sexy primes (2nd member) | 128th | |
| Sexy prime triplets (3rd member) | 50th | |
| Twin primes (2nd member) | 61st | |
| Roman numberals | MCMLXXXIX | MCMXCIX |
| Base 2 | 111110001012 | 111110011112 |
| Base 3 | 22012003 | 22020013 |
| Base 4 | 1330114 | 1330334 |
| Base 5 | 304245 | 304445 |
| Base 6 | 131136 | 131316 |
| Base 7 | 55417 | 55547 |
| Base 8 | 37058 | 37178 |
| Base 9 | 26509 | 26619 |
| Base 10 | 198910 | 199910 |
| Base 11 | 154911 | 155811 |
| Base 12 | 119912 | 11a712 |
| Base 13 | ba013 | baa13 |
| Base 14 | a2114 | a2b14 |
| Base 15 | 8c915 | 8d415 |
| Base 16 | 7c516 | 7cf16 |