Compare 661 vs 1201
| Property | 661 | 1201 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 6611 | 12011 |
| Prime factorization | 661 | 1201 |
| Divisors count | 2 | 2 |
| Divisors | 1, 661 | 1, 1201 |
| Number of properties | 5 | 11 |
| Additive primes | 65th | |
| Centered decagonal primes | 8th | 11th |
| Centered square primes | 12th | |
| Chen primes | 130th | |
| Cuban primes 2 | 6th | |
| Emirps | 51st | |
| Harmonic primes | 69th | |
| Isolated primes | 116th | |
| Lucky primes | 51st | |
| Primes | 121st | 197th |
| Pythagorean primes | 57th | 96th |
| Super primes | 45th | |
| Twin primes (2nd member) | 30th | |
| Roman numberals | DCLXI | MCCI |
| Base 2 | 10100101012 | 100101100012 |
| Base 3 | 2201113 | 11221113 |
| Base 4 | 221114 | 1023014 |
| Base 5 | 101215 | 143015 |
| Base 6 | 30216 | 53216 |
| Base 7 | 16337 | 33347 |
| Base 8 | 12258 | 22618 |
| Base 9 | 8149 | 15749 |
| Base 10 | 66110 | 120110 |
| Base 11 | 55111 | 9a211 |
| Base 12 | 47112 | 84112 |
| Base 13 | 3bb13 | 71513 |
| Base 14 | 35314 | 61b14 |
| Base 15 | 2e115 | 55115 |
| Base 16 | 29516 | 4b116 |