Compare 1999 vs 2006
| Property | 1999 | 2006 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 1 | 3 |
| Prime factorization | 19991 | 21 × 171 × 591 |
| Prime factorization | 1999 | 2 × 17 × 59 |
| Divisors count | 2 | 8 |
| Divisors | 1, 1999 | 1, 2, 17, 34, 59, 118, 1003, 2006 |
| 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 | MMVI |
| Base 2 | 111110011112 | 111110101102 |
| Base 3 | 22020013 | 22020223 |
| Base 4 | 1330334 | 1331124 |
| Base 5 | 304445 | 310115 |
| Base 6 | 131316 | 131426 |
| Base 7 | 55547 | 55647 |
| Base 8 | 37178 | 37268 |
| Base 9 | 26619 | 26689 |
| Base 10 | 199910 | 200610 |
| Base 11 | 155811 | 156411 |
| Base 12 | 11a712 | 11b212 |
| Base 13 | baa13 | bb413 |
| Base 14 | a2b14 | a3414 |
| Base 15 | 8d415 | 8db15 |
| Base 16 | 7cf16 | 7d616 |