Compare 151 vs 661
| Property | 151 | 661 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 1511 | 6611 |
| Prime factorization | 151 | 661 |
| Divisors count | 2 | 2 |
| Divisors | 1, 151 | 1, 661 |
| Number of properties | 9 | 5 |
| Additive primes | 20th | 65th |
| Centered decagonal primes | 5th | 8th |
| Lucky primes | 11th | |
| Multiplicative primes | 11th | |
| Palindromic primes | 8th | |
| Primes | 36th | 121st |
| Pythagorean primes | 57th | |
| Sexy primes (1st member) | 21st | |
| Sexy prime triplets (1st member) | 12th | |
| Twin primes (2nd member) | 12th | 30th |
| Roman numberals | CLI | DCLXI |
| Base 2 | 100101112 | 10100101012 |
| Base 3 | 121213 | 2201113 |
| Base 4 | 21134 | 221114 |
| Base 5 | 11015 | 101215 |
| Base 6 | 4116 | 30216 |
| Base 7 | 3047 | 16337 |
| Base 8 | 2278 | 12258 |
| Base 9 | 1779 | 8149 |
| Base 10 | 15110 | 66110 |
| Base 11 | 12811 | 55111 |
| Base 12 | 10712 | 47112 |
| Base 13 | b813 | 3bb13 |
| Base 14 | ab14 | 35314 |
| Base 15 | a115 | 2e115 |
| Base 16 | 9716 | 29516 |