Compare 661 vs 821
Property | 661 | 821 |
---|---|---|
Type | prime | prime |
Unique factors | 1 | 1 |
Total factors | 1 | 1 |
Prime factorization | 6611 | 8211 |
Prime factorization | 661 | 821 |
Divisors count | 2 | 2 |
Divisors | 1, 661 | 1, 821 |
Number of properties | 5 | 10 |
Additive primes | 65th | 75th |
Centered decagonal primes | 8th | |
Chen primes | 97th | |
Good primes | 40th | |
Long primes | 50th | |
Primes | 121st | 142nd |
Prime quadruplets (1st member) | 5th | |
Prime triplets (1st member) | 25th | |
Pythagorean primes | 57th | 69th |
Sexy primes (1st member) | 64th | |
Twin primes (1st member) | 32nd | |
Twin primes (2nd member) | 30th | |
Roman numberals | DCLXI | DCCCXXI |
Base 2 | 10100101012 | 11001101012 |
Base 3 | 2201113 | 10101023 |
Base 4 | 221114 | 303114 |
Base 5 | 101215 | 112415 |
Base 6 | 30216 | 34456 |
Base 7 | 16337 | 22527 |
Base 8 | 12258 | 14658 |
Base 9 | 8149 | 11129 |
Base 10 | 66110 | 82110 |
Base 11 | 55111 | 68711 |
Base 12 | 47112 | 58512 |
Base 13 | 3bb13 | 4b213 |
Base 14 | 35314 | 42914 |
Base 15 | 2e115 | 39b15 |
Base 16 | 29516 | 33516 |