Compare 1391 vs 1399
| Property | 1391 | 1399 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 131 × 1071 | 13991 |
| Prime factorization | 13 × 107 | 1399 |
| Divisors count | 4 | 2 |
| Divisors | 1, 13, 107, 1391 | 1, 1399 |
| Number of properties | 1 | 6 |
| Chen primes | 145th | |
| Emirps | 65th | |
| Good primes | 52nd | |
| Harmonic primes | 76th | |
| Isolated primes | 131st | |
| Primes | 222nd | |
| Semiprimes | 412th | |
| Roman numberals | MCCCXCI | MCCCXCIX |
| Base 2 | 101011011112 | 101011101112 |
| Base 3 | 12201123 | 12202113 |
| Base 4 | 1112334 | 1113134 |
| Base 5 | 210315 | 210445 |
| Base 6 | 102356 | 102516 |
| Base 7 | 40257 | 40367 |
| Base 8 | 25578 | 25678 |
| Base 9 | 18159 | 18249 |
| Base 10 | 139110 | 139910 |
| Base 11 | 105511 | 106211 |
| Base 12 | 97b12 | 98712 |
| Base 13 | 83013 | 83813 |
| Base 14 | 71514 | 71d14 |
| Base 15 | 62b15 | 63415 |
| Base 16 | 56f16 | 57716 |