Compare 4 vs 9
| Property | 4 | 9 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 1 | 1 |
| Total factors | 2 | 2 |
| Prime factorization | 22 | 32 |
| Prime factorization | 2 × 2 | 3 × 3 |
| Divisors count | 3 | 3 |
| Divisors | 1, 2, 4 | 1, 3, 9 |
| Number of properties | 1 | 1 |
| Semiprimes | 1st | 3rd |
| Roman numberals | IV | IX |
| Base 2 | 1002 | 10012 |
| Base 3 | 113 | 1003 |
| Base 4 | 104 | 214 |
| Base 5 | 45 | 145 |
| Base 6 | 46 | 136 |
| Base 7 | 47 | 127 |
| Base 8 | 48 | 118 |
| Base 9 | 49 | 109 |
| Base 10 | 410 | 910 |
| Base 11 | 411 | 911 |
| Base 12 | 412 | 912 |
| Base 13 | 413 | 913 |
| Base 14 | 414 | 914 |
| Base 15 | 415 | 915 |
| Base 16 | 416 | 916 |