Compare 1919 vs 1921
| Property | 1919 | 1921 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 191 × 1011 | 171 × 1131 |
| Prime factorization | 19 × 101 | 17 × 113 |
| Divisors count | 4 | 4 |
| Divisors | 1, 19, 101, 1919 | 1, 17, 113, 1921 |
| Number of properties | 1 | 1 |
| Semiprimes | 551st | 552nd |
| Roman numberals | MCMXIX | MCMXXI |
| Base 2 | 111011111112 | 111100000012 |
| Base 3 | 21220023 | 21220113 |
| Base 4 | 1313334 | 1320014 |
| Base 5 | 301345 | 301415 |
| Base 6 | 125156 | 125216 |
| Base 7 | 54117 | 54137 |
| Base 8 | 35778 | 36018 |
| Base 9 | 25629 | 25649 |
| Base 10 | 191910 | 192110 |
| Base 11 | 149511 | 149711 |
| Base 12 | 113b12 | 114112 |
| Base 13 | b4813 | b4a13 |
| Base 14 | 9b114 | 9b314 |
| Base 15 | 87e15 | 88115 |
| Base 16 | 77f16 | 78116 |