Compare 421 vs 643
| Property | 421 | 643 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 4211 | 6431 |
| Prime factorization | 421 | 643 |
| Divisors count | 2 | 2 |
| Divisors | 1, 421 | 1, 643 |
| Number of properties | 6 | 7 |
| Additive primes | 48th | 63rd |
| Centered square primes | 8th | |
| Cousin primes (1st member) | 29th | |
| Left-truncatable primes | 38th | |
| Lucky primes | 23rd | 33rd |
| Primes | 82nd | 117th |
| Prime triplets (2nd member) | 24th | |
| Pythagorean primes | 40th | |
| Twin primes (2nd member) | 22nd | 29th |
| Roman numberals | CDXXI | DCXLIII |
| Base 2 | 1101001012 | 10100000112 |
| Base 3 | 1201213 | 2122113 |
| Base 4 | 122114 | 220034 |
| Base 5 | 31415 | 100335 |
| Base 6 | 15416 | 25516 |
| Base 7 | 11417 | 16067 |
| Base 8 | 6458 | 12038 |
| Base 9 | 5179 | 7849 |
| Base 10 | 42110 | 64310 |
| Base 11 | 35311 | 53511 |
| Base 12 | 2b112 | 45712 |
| Base 13 | 26513 | 3a613 |
| Base 14 | 22114 | 33d14 |
| Base 15 | 1d115 | 2cd15 |
| Base 16 | 1a516 | 28316 |