Compare 47 vs 521
| Property | 47 | 521 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 471 | 5211 |
| Prime factorization | 47 | 521 |
| Divisors count | 2 | 2 |
| Divisors | 1, 47 | 1, 521 |
| Number of properties | 21 | 6 |
| Additive primes | 10th | |
| Carol primes | 2nd | |
| Chen primes | 14th | 70th |
| Class 1+ primes | 9th | |
| Cousin primes (2nd member) | 6th | |
| Isolated primes | 4th | |
| Left-truncatable primes | 10th | |
| Long primes | 6th | |
| Lucas primes | 6th | 8th |
| Pierpont primes of the 2nd kind | 9th | |
| Primes | 15th | 98th |
| Prime triplets (3rd member) | 7th | |
| Pythagorean primes | 46th | |
| Safe primes | 5th | |
| Sexy primes (1st member) | 10th | |
| Sexy primes (2nd member) | 9th | |
| Sexy prime quadrupletss (2nd member) | 3rd | |
| Sexy prime triplets (1st member) | 7th | |
| Sexy prime triplets (2nd member) | 6th | |
| Solinas primes | 13th | 39th |
| Thabit primes | 5th | |
| Twin primes (1st member) | 25th | |
| Ulam primes | 5th | |
| Roman numberals | XLVII | DXXI |
| Base 2 | 1011112 | 10000010012 |
| Base 3 | 12023 | 2010223 |
| Base 4 | 2334 | 200214 |
| Base 5 | 1425 | 40415 |
| Base 6 | 1156 | 22256 |
| Base 7 | 657 | 13437 |
| Base 8 | 578 | 10118 |
| Base 9 | 529 | 6389 |
| Base 10 | 4710 | 52110 |
| Base 11 | 4311 | 43411 |
| Base 12 | 3b12 | 37512 |
| Base 13 | 3813 | 31113 |
| Base 14 | 3514 | 29314 |
| Base 15 | 3215 | 24b15 |
| Base 16 | 2f16 | 20916 |