Compare 2009 vs 2011
| Property | 2009 | 2011 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 2 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 72 × 411 | 20111 |
| Prime factorization | 7 × 7 × 41 | 2011 |
| Divisors count | 6 | 2 |
| Divisors | 1, 7, 41, 49, 287, 2009 | 1, 2011 |
| Number of properties | 0 | 4 |
| Harmonic primes | 113th | |
| Isolated primes | 184th | |
| Primes | 305th | |
| Sexy primes (1st member) | 130th | |
| Roman numberals | MMIX | MMXI |
| Base 2 | 111110110012 | 111110110112 |
| Base 3 | 22021023 | 22021113 |
| Base 4 | 1331214 | 1331234 |
| Base 5 | 310145 | 310215 |
| Base 6 | 131456 | 131516 |
| Base 7 | 56007 | 56027 |
| Base 8 | 37318 | 37338 |
| Base 9 | 26729 | 26749 |
| Base 10 | 200910 | 201110 |
| Base 11 | 156711 | 156911 |
| Base 12 | 11b512 | 11b712 |
| Base 13 | bb713 | bb913 |
| Base 14 | a3714 | a3914 |
| Base 15 | 8de15 | 8e115 |
| Base 16 | 7d916 | 7db16 |