Compare 1999 vs 2008
| Property | 1999 | 2008 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 2 |
| Total factors | 1 | 4 |
| Prime factorization | 19991 | 23 × 2511 |
| Prime factorization | 1999 | 2 × 2 × 2 × 251 |
| Divisors count | 2 | 8 |
| Divisors | 1, 1999 | 1, 2, 4, 8, 251, 502, 1004, 2008 |
| Number of properties | 8 | 0 |
| 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 | MCMXCIX | MMVIII |
| Base 2 | 111110011112 | 111110110002 |
| Base 3 | 22020013 | 22021013 |
| Base 4 | 1330334 | 1331204 |
| Base 5 | 304445 | 310135 |
| Base 6 | 131316 | 131446 |
| Base 7 | 55547 | 55667 |
| Base 8 | 37178 | 37308 |
| Base 9 | 26619 | 26719 |
| Base 10 | 199910 | 200810 |
| Base 11 | 155811 | 156611 |
| Base 12 | 11a712 | 11b412 |
| Base 13 | baa13 | bb613 |
| Base 14 | a2b14 | a3614 |
| Base 15 | 8d415 | 8dd15 |
| Base 16 | 7cf16 | 7d816 |