Compare 2005 vs 2011
| Property | 2005 | 2011 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 51 × 4011 | 20111 |
| Prime factorization | 5 × 401 | 2011 |
| Divisors count | 4 | 2 |
| Divisors | 1, 5, 401, 2005 | 1, 2011 |
| Number of properties | 1 | 4 |
| Harmonic primes | 113th | |
| Isolated primes | 184th | |
| Primes | 305th | |
| Semiprimes | 578th | |
| Sexy primes (1st member) | 130th | |
| Roman numberals | MMV | MMXI |
| Base 2 | 111110101012 | 111110110112 |
| Base 3 | 22020213 | 22021113 |
| Base 4 | 1331114 | 1331234 |
| Base 5 | 310105 | 310215 |
| Base 6 | 131416 | 131516 |
| Base 7 | 55637 | 56027 |
| Base 8 | 37258 | 37338 |
| Base 9 | 26679 | 26749 |
| Base 10 | 200510 | 201110 |
| Base 11 | 156311 | 156911 |
| Base 12 | 11b112 | 11b712 |
| Base 13 | bb313 | bb913 |
| Base 14 | a3314 | a3914 |
| Base 15 | 8da15 | 8e115 |
| Base 16 | 7d516 | 7db16 |