The folowing table expresses '1581' in various number bases. 'DRx' shows the result of 'digit reducing' resulting in an X-digit long number.
| Base | DR11 | DR10 | DR9 | DR8 | DR7 | DR6 | DR5 | DR4 | DR3 | DR2 | DR1 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2 | 11000101101 | 110 | 10 | 1 | |||||||
| 3 | 2011120 | 21,10 | 1 | ||||||||
| 4 | 120231 | 21 | 3 | ||||||||
| 5 | 22311 | 14,10 | 1 | ||||||||
| 6 | 11153 | 15,10 | 1 | ||||||||
| 7 | 4416 | 21 | 3 | ||||||||
| 8 | 3055 | 15 | 6 | ||||||||
| 9 | 2146 | 14 | 5 | ||||||||
| 10 | 1581 | 15 | 6 | ||||||||
| 11 | 1208 | 10 | 1 | ||||||||
| 12 | AB9 | 26 | 8 | ||||||||
| 13 | 948 | 18 | 9 | ||||||||
| 14 | 80D | 17 | 8 | ||||||||
| 15 | 706 | D | |||||||||
| 16 | 62D | 15 | 6 |
Factors: 3 * 17 * 31