Compare 2581 vs 2591
| Property | 2581 | 2591 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 291 × 891 | 25911 |
| Prime factorization | 29 × 89 | 2591 |
| Divisors count | 4 | 2 |
| Divisors | 1, 29, 89, 2581 | 1, 2591 |
| Number of properties | 1 | 6 |
| Additive primes | 198th | |
| Chen primes | 228th | |
| Class 1+ primes | 21st | |
| Pierpont primes of the 2nd kind | 21st | |
| Primes | 377th | |
| Semiprimes | 733rd | |
| Twin primes (1st member) | 74th | |
| Roman numberals | MMDLXXXI | MMDXCI |
| Base 2 | 1010000101012 | 1010000111112 |
| Base 3 | 101121213 | 101122223 |
| Base 4 | 2201114 | 2201334 |
| Base 5 | 403115 | 403315 |
| Base 6 | 155416 | 155556 |
| Base 7 | 103457 | 103617 |
| Base 8 | 50258 | 50378 |
| Base 9 | 34779 | 34889 |
| Base 10 | 258110 | 259110 |
| Base 11 | 1a3711 | 1a4611 |
| Base 12 | 15b112 | 15bb12 |
| Base 13 | 123713 | 124413 |
| Base 14 | d2514 | d3114 |
| Base 15 | b7115 | b7b15 |
| Base 16 | a1516 | a1f16 |