Compare 2551 vs 2561
| Property | 2551 | 2561 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 25511 | 131 × 1971 |
| Prime factorization | 2551 | 13 × 197 |
| Divisors count | 2 | 4 |
| Divisors | 1, 2551 | 1, 13, 197, 2561 |
| Number of properties | 4 | 1 |
| Additive primes | 195th | |
| Primes | 374th | |
| Semiprimes | 724th | |
| Sexy primes (1st member) | 153rd | |
| Twin primes (2nd member) | 73rd | |
| Roman numberals | MMDLI | MMDLXI |
| Base 2 | 1001111101112 | 1010000000012 |
| Base 3 | 101111113 | 101112123 |
| Base 4 | 2133134 | 2200014 |
| Base 5 | 402015 | 402215 |
| Base 6 | 154516 | 155056 |
| Base 7 | 103037 | 103167 |
| Base 8 | 47678 | 50018 |
| Base 9 | 34449 | 34559 |
| Base 10 | 255110 | 256110 |
| Base 11 | 1a0a11 | 1a1911 |
| Base 12 | 158712 | 159512 |
| Base 13 | 121313 | 122013 |
| Base 14 | d0314 | d0d14 |
| Base 15 | b5115 | b5b15 |
| Base 16 | 9f716 | a0116 |