Compare 643 vs 787
| Property | 643 | 787 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 6431 | 7871 |
| Prime factorization | 643 | 787 |
| Divisors count | 2 | 2 |
| Divisors | 1, 643 | 1, 787 |
| Number of properties | 7 | 6 |
| Additive primes | 63rd | |
| Chen primes | 93rd | |
| Cousin primes (1st member) | 29th | |
| Harmonic primes | 54th | |
| Isolated primes | 79th | |
| Left-truncatable primes | 38th | |
| Lucky primes | 33rd | 38th |
| Palindromic primes | 17th | |
| Primes | 117th | 138th |
| Prime triplets (2nd member) | 24th | |
| Twin primes (2nd member) | 29th | |
| Roman numberals | DCXLIII | DCCLXXXVII |
| Base 2 | 10100000112 | 11000100112 |
| Base 3 | 2122113 | 10020113 |
| Base 4 | 220034 | 301034 |
| Base 5 | 100335 | 111225 |
| Base 6 | 25516 | 33516 |
| Base 7 | 16067 | 22037 |
| Base 8 | 12038 | 14238 |
| Base 9 | 7849 | 10649 |
| Base 10 | 64310 | 78710 |
| Base 11 | 53511 | 65611 |
| Base 12 | 45712 | 55712 |
| Base 13 | 3a613 | 48713 |
| Base 14 | 33d14 | 40314 |
| Base 15 | 2cd15 | 37715 |
| Base 16 | 28316 | 31316 |