Compare 1667 vs 1721
| Property | 1667 | 1721 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 16671 | 17211 |
| Prime factorization | 1667 | 1721 |
| Divisors count | 2 | 2 |
| Divisors | 1, 1667 | 1, 1721 |
| Number of properties | 6 | 6 |
| Additive primes | 143rd | |
| Chen primes | 165th | 169th |
| Cousin primes (2nd member) | 59th | |
| Harmonic primes | 92nd | |
| Primes | 262nd | 268th |
| Prime triplets (2nd member) | 43rd | |
| Pythagorean primes | 130th | |
| Twin primes (1st member) | 53rd | 55th |
| Ulam primes | 25th | |
| Roman numberals | MDCLXVII | MDCCXXI |
| Base 2 | 110100000112 | 110101110012 |
| Base 3 | 20212023 | 21002023 |
| Base 4 | 1220034 | 1223214 |
| Base 5 | 231325 | 233415 |
| Base 6 | 114156 | 115456 |
| Base 7 | 46017 | 50067 |
| Base 8 | 32038 | 32718 |
| Base 9 | 22529 | 23229 |
| Base 10 | 166710 | 172110 |
| Base 11 | 128611 | 132511 |
| Base 12 | b6b12 | bb512 |
| Base 13 | 9b313 | a2513 |
| Base 14 | 87114 | 8ad14 |
| Base 15 | 76215 | 79b15 |
| Base 16 | 68316 | 6b916 |