The folowing table expresses '81' in various number bases. 'DRx' shows the result of 'digit reducing' resulting in an X-digit long number.
Base | DR7 | DR6 | DR5 | DR4 | DR3 | DR2 | DR1 |
---|---|---|---|---|---|---|---|
2 | 1010001 | 11,10 | 1 | ||||
3 | 10000 | 1 | |||||
4 | 1101 | 3 | |||||
5 | 311 | 10 | 1 | ||||
6 | 213 | 10 | 1 | ||||
7 | 144 | 12 | 3 | ||||
8 | 121 | 4 | |||||
9 | 100 | 1 | |||||
10 | 81 | 9 | |||||
11 | 74,10 | 1 | |||||
12 | 69,13 | 4 | |||||
13 | 63 | 9 | |||||
14 | 5B,12 | 3 | |||||
15 | 56 | B | |||||
16 | 51 | 6 |
Factors: 34
81 is in the Pythagorean Triple: (81, 3280, 3281).
81 is the atomic weight of Thallium (Tl).