Compare 1553 vs 1621
| Property | 1553 | 1621 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 15531 | 16211 |
| Prime factorization | 1553 | 1621 |
| Divisors count | 2 | 2 |
| Divisors | 1, 1553 | 1, 1621 |
| Number of properties | 8 | 8 |
| Chen primes | 156th | 163rd |
| Cousin primes (2nd member) | 54th | |
| Harmonic primes | 89th | |
| Isolated primes | 146th | |
| Long primes | 94th | 101st |
| Primes | 245th | 257th |
| Pythagorean primes | 118th | 123rd |
| Sexy primes (1st member) | 107th | 111th |
| Super primes | 55th | |
| Twin primes (2nd member) | 52nd | |
| Ulam primes | 23rd | |
| Roman numberals | MDLIII | MDCXXI |
| Base 2 | 110000100012 | 110010101012 |
| Base 3 | 20101123 | 20200013 |
| Base 4 | 1201014 | 1211114 |
| Base 5 | 222035 | 224415 |
| Base 6 | 111056 | 113016 |
| Base 7 | 43467 | 45047 |
| Base 8 | 30218 | 31258 |
| Base 9 | 21159 | 22019 |
| Base 10 | 155310 | 162110 |
| Base 11 | 119211 | 124411 |
| Base 12 | a9512 | b3112 |
| Base 13 | 92613 | 97913 |
| Base 14 | 7cd14 | 83b14 |
| Base 15 | 6d815 | 73115 |
| Base 16 | 61116 | 65516 |