Compare 661 vs 691
Property | 661 | 691 |
---|---|---|
Type | prime | prime |
Unique factors | 1 | 1 |
Total factors | 1 | 1 |
Prime factorization | 6611 | 6911 |
Prime factorization | 661 | 691 |
Divisors count | 2 | 2 |
Divisors | 1, 661 | 1, 691 |
Number of properties | 5 | 3 |
Additive primes | 65th | |
Centered decagonal primes | 8th | |
Harmonic primes | 50th | |
Isolated primes | 66th | |
Primes | 121st | 125th |
Pythagorean primes | 57th | |
Twin primes (2nd member) | 30th | |
Roman numberals | DCLXI | DCXCI |
Base 2 | 10100101012 | 10101100112 |
Base 3 | 2201113 | 2211213 |
Base 4 | 221114 | 223034 |
Base 5 | 101215 | 102315 |
Base 6 | 30216 | 31116 |
Base 7 | 16337 | 20057 |
Base 8 | 12258 | 12638 |
Base 9 | 8149 | 8479 |
Base 10 | 66110 | 69110 |
Base 11 | 55111 | 57911 |
Base 12 | 47112 | 49712 |
Base 13 | 3bb13 | 41213 |
Base 14 | 35314 | 37514 |
Base 15 | 2e115 | 31115 |
Base 16 | 29516 | 2b316 |