Compare 6421 vs 6661
| Property | 6421 | 6661 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 64211 | 66611 |
| Prime factorization | 6421 | 6661 |
| Divisors count | 2 | 2 |
| Divisors | 1, 6421 | 1, 6661 |
| Number of properties | 7 | 11 |
| Additive primes | 419th | 428th |
| Centered decagonal primes | 23rd | |
| Chen primes | 456th | 469th |
| Happy primes | 147th | |
| Harmonic primes | 301st | 312th |
| Isolated primes | 538th | |
| Long primes | 329th | |
| Lucky primes | 160th | |
| Primes | 835th | 859th |
| Pythagorean primes | 410th | 423rd |
| Sexy primes (1st member) | 302nd | |
| Super primes | 149th | |
| Twin primes (2nd member) | 153rd | |
| Roman numberals | ||
| Base 2 | 11001000101012 | 11010000001012 |
| Base 3 | 222102113 | 1000102013 |
| Base 4 | 12101114 | 12200114 |
| Base 5 | 2011415 | 2031215 |
| Base 6 | 454216 | 505016 |
| Base 7 | 245027 | 252647 |
| Base 8 | 144258 | 150058 |
| Base 9 | 87249 | 101219 |
| Base 10 | 642110 | 666110 |
| Base 11 | 490811 | 500611 |
| Base 12 | 387112 | 3a3112 |
| Base 13 | 2bcc13 | 305513 |
| Base 14 | 24a914 | 25db14 |
| Base 15 | 1d8115 | 1e9115 |
| Base 16 | 191516 | 1a0516 |