Compare 1945 vs 1951
| Property | 1945 | 1951 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 51 × 3891 | 19511 |
| Prime factorization | 5 × 389 | 1951 |
| Divisors count | 4 | 2 |
| Divisors | 1, 5, 389, 1945 | 1, 1951 |
| Number of properties | 1 | 3 |
| Cuban primes 1 | 14th | |
| Primes | 297th | |
| Semiprimes | 562nd | |
| Twin primes (2nd member) | 60th | |
| Roman numberals | MCMXLV | MCMLI |
| Base 2 | 111100110012 | 111100111112 |
| Base 3 | 22000013 | 22000213 |
| Base 4 | 1321214 | 1321334 |
| Base 5 | 302405 | 303015 |
| Base 6 | 130016 | 130116 |
| Base 7 | 54467 | 54557 |
| Base 8 | 36318 | 36378 |
| Base 9 | 26019 | 26079 |
| Base 10 | 194510 | 195110 |
| Base 11 | 150911 | 151411 |
| Base 12 | 116112 | 116712 |
| Base 13 | b6813 | b7113 |
| Base 14 | 9cd14 | 9d514 |
| Base 15 | 89a15 | 8a115 |
| Base 16 | 79916 | 79f16 |