Compare 1913 vs 1920
| Property | 1913 | 1920 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 1 | 9 |
| Prime factorization | 19131 | 27 × 31 × 51 |
| Prime factorization | 1913 | 2 × 2 × 2 × 2 × 2 × 2 × 2 × 3 × 5 |
| Divisors count | 2 | 32 |
| Divisors | 1, 1913 | 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 48, 60, 64, 80, 96, 120, 128, 160, 192, 240, 320, 384, 480, 640, 960, 1920 |
| Number of properties | 9 | 0 |
| Chen primes | 181st | |
| Emirps | 93rd | |
| Isolated primes | 178th | |
| Long primes | 114th | |
| Primes | 293rd | |
| Pythagorean primes | 142nd | |
| Sexy primes (2nd member) | 125th | |
| Sexy prime triplets (3rd member) | 49th | |
| Super primes | 62nd | |
| Roman numberals | MCMXIII | MCMXX |
| Base 2 | 111011110012 | 111100000002 |
| Base 3 | 21212123 | 21220103 |
| Base 4 | 1313214 | 1320004 |
| Base 5 | 301235 | 301405 |
| Base 6 | 125056 | 125206 |
| Base 7 | 54027 | 54127 |
| Base 8 | 35718 | 36008 |
| Base 9 | 25559 | 25639 |
| Base 10 | 191310 | 192010 |
| Base 11 | 148a11 | 149611 |
| Base 12 | 113512 | 114012 |
| Base 13 | b4213 | b4913 |
| Base 14 | 9a914 | 9b214 |
| Base 15 | 87815 | 88015 |
| Base 16 | 77916 | 78016 |