Compare 251 vs 251
| Property | 251 | 251 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 2511 | 2511 |
| Prime factorization | 251 | 251 |
| Divisors count | 2 | 2 |
| Divisors | 1, 251 | 1, 251 |
| Number of properties | 10 | 10 |
| Chen primes | 41st | 41st |
| Good primes | 19th | 19th |
| Harmonic primes | 20th | 20th |
| Isolated primes | 21st | 21st |
| Primes | 54th | 54th |
| Sexy primes (1st member) | 30th | 30th |
| Sexy prime quadrupletss (1st member) | 5th | 5th |
| Sexy prime triplets (1st member) | 15th | 15th |
| Solinas primes | 30th | 30th |
| Sophie germain primes | 18th | 18th |
| Roman numberals | CCLI | CCLI |
| Base 2 | 111110112 | 111110112 |
| Base 3 | 1000223 | 1000223 |
| Base 4 | 33234 | 33234 |
| Base 5 | 20015 | 20015 |
| Base 6 | 10556 | 10556 |
| Base 7 | 5067 | 5067 |
| Base 8 | 3738 | 3738 |
| Base 9 | 3089 | 3089 |
| Base 10 | 25110 | 25110 |
| Base 11 | 20911 | 20911 |
| Base 12 | 18b12 | 18b12 |
| Base 13 | 16413 | 16413 |
| Base 14 | 13d14 | 13d14 |
| Base 15 | 11b15 | 11b15 |
| Base 16 | fb16 | fb16 |