Compare 641 vs 647
| Property | 641 | 647 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 6411 | 6471 |
| Prime factorization | 641 | 647 |
| Divisors count | 2 | 2 |
| Divisors | 1, 641 | 1, 647 |
| Number of properties | 14 | 15 |
| Additive primes | 62nd | 64th |
| Chen primes | 81st | 82nd |
| Class 1+ primes | 17th | |
| Cousin primes (2nd member) | 29th | |
| Good primes | 35th | |
| Isolated primes | 61st | |
| Left-truncatable primes | 39th | |
| Long primes | 43rd | |
| Pierpont primes of the 2nd kind | 17th | |
| Primes | 116th | 118th |
| Prime triplets (1st member) | 24th | |
| Prime triplets (3rd member) | 24th | |
| Proth primes | 14th | |
| Pythagorean primes | 55th | |
| Quartan primes | 6th | |
| Sexy primes (1st member) | 57th | 58th |
| Sexy primes (2nd member) | 57th | |
| Sexy prime quadrupletss (1st member) | 7th | |
| Sexy prime quadrupletss (2nd member) | 7th | |
| Sexy prime triplets (1st member) | 24th | 25th |
| Sexy prime triplets (2nd member) | 24th | |
| Solinas primes | 41st | |
| Sophie germain primes | 28th | |
| Twin primes (1st member) | 29th | |
| Roman numberals | DCXLI | DCXLVII |
| Base 2 | 10100000012 | 10100001112 |
| Base 3 | 2122023 | 2122223 |
| Base 4 | 220014 | 220134 |
| Base 5 | 100315 | 100425 |
| Base 6 | 25456 | 25556 |
| Base 7 | 16047 | 16137 |
| Base 8 | 12018 | 12078 |
| Base 9 | 7829 | 7889 |
| Base 10 | 64110 | 64710 |
| Base 11 | 53311 | 53911 |
| Base 12 | 45512 | 45b12 |
| Base 13 | 3a413 | 3aa13 |
| Base 14 | 33b14 | 34314 |
| Base 15 | 2cb15 | 2d215 |
| Base 16 | 28116 | 28716 |