Compare 1978 vs 1981
| Property | 1978 | 1981 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 3 | 2 |
| Total factors | 3 | 2 |
| Prime factorization | 21 × 231 × 431 | 71 × 2831 |
| Prime factorization | 2 × 23 × 43 | 7 × 283 |
| Divisors count | 8 | 4 |
| Divisors | 1, 2, 23, 43, 46, 86, 989, 1978 | 1, 7, 283, 1981 |
| Number of properties | 0 | 1 |
| Semiprimes | 572nd | |
| Roman numberals | MCMLXXVIII | MCMLXXXI |
| Base 2 | 111101110102 | 111101111012 |
| Base 3 | 22010213 | 22011013 |
| Base 4 | 1323224 | 1323314 |
| Base 5 | 304035 | 304115 |
| Base 6 | 130546 | 131016 |
| Base 7 | 55247 | 55307 |
| Base 8 | 36728 | 36758 |
| Base 9 | 26379 | 26419 |
| Base 10 | 197810 | 198110 |
| Base 11 | 153911 | 154111 |
| Base 12 | 118a12 | 119112 |
| Base 13 | b9213 | b9513 |
| Base 14 | a1414 | a1714 |
| Base 15 | 8bd15 | 8c115 |
| Base 16 | 7ba16 | 7bd16 |