Compare 661 vs 2311
| Property | 661 | 2311 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 6611 | 23111 |
| Prime factorization | 661 | 2311 |
| Divisors count | 2 | 2 |
| Divisors | 1, 661 | 1, 2311 |
| Number of properties | 5 | 6 |
| Additive primes | 65th | 180th |
| Centered decagonal primes | 8th | 15th |
| Euclid primes | 6th | |
| Lucky primes | 78th | |
| Primes | 121st | 344th |
| Pythagorean primes | 57th | |
| Twin primes (2nd member) | 30th | 70th |
| Roman numberals | DCLXI | MMCCCXI |
| Base 2 | 10100101012 | 1001000001112 |
| Base 3 | 2201113 | 100111213 |
| Base 4 | 221114 | 2100134 |
| Base 5 | 101215 | 332215 |
| Base 6 | 30216 | 144116 |
| Base 7 | 16337 | 65117 |
| Base 8 | 12258 | 44078 |
| Base 9 | 8149 | 31479 |
| Base 10 | 66110 | 231110 |
| Base 11 | 55111 | 181111 |
| Base 12 | 47112 | 140712 |
| Base 13 | 3bb13 | 108a13 |
| Base 14 | 35314 | bb114 |
| Base 15 | 2e115 | a4115 |
| Base 16 | 29516 | 90716 |