Compare 1951 vs 1961
| Property | 1951 | 1961 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 19511 | 371 × 531 |
| Prime factorization | 1951 | 37 × 53 |
| Divisors count | 2 | 4 |
| Divisors | 1, 1951 | 1, 37, 53, 1961 |
| Number of properties | 3 | 1 |
| Cuban primes 1 | 14th | |
| Primes | 297th | |
| Semiprimes | 566th | |
| Twin primes (2nd member) | 60th | |
| Roman numberals | MCMLI | MCMLXI |
| Base 2 | 111100111112 | 111101010012 |
| Base 3 | 22000213 | 22001223 |
| Base 4 | 1321334 | 1322214 |
| Base 5 | 303015 | 303215 |
| Base 6 | 130116 | 130256 |
| Base 7 | 54557 | 55017 |
| Base 8 | 36378 | 36518 |
| Base 9 | 26079 | 26189 |
| Base 10 | 195110 | 196110 |
| Base 11 | 151411 | 152311 |
| Base 12 | 116712 | 117512 |
| Base 13 | b7113 | b7b13 |
| Base 14 | 9d514 | a0114 |
| Base 15 | 8a115 | 8ab15 |
| Base 16 | 79f16 | 7a916 |