Compare 1999 vs 2010
| Property | 1999 | 2010 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 4 |
| Total factors | 1 | 4 |
| Prime factorization | 19991 | 21 × 31 × 51 × 671 |
| Prime factorization | 1999 | 2 × 3 × 5 × 67 |
| Divisors count | 2 | 16 |
| Divisors | 1, 1999 | 1, 2, 3, 5, 6, 10, 15, 30, 67, 134, 201, 335, 402, 670, 1005, 2010 |
| 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 | MMX |
| Base 2 | 111110011112 | 111110110102 |
| Base 3 | 22020013 | 22021103 |
| Base 4 | 1330334 | 1331224 |
| Base 5 | 304445 | 310205 |
| Base 6 | 131316 | 131506 |
| Base 7 | 55547 | 56017 |
| Base 8 | 37178 | 37328 |
| Base 9 | 26619 | 26739 |
| Base 10 | 199910 | 201010 |
| Base 11 | 155811 | 156811 |
| Base 12 | 11a712 | 11b612 |
| Base 13 | baa13 | bb813 |
| Base 14 | a2b14 | a3814 |
| Base 15 | 8d415 | 8e015 |
| Base 16 | 7cf16 | 7da16 |