| Base 10 | 81 (2 digits) | ||
| Digit Sum: 9 | Digital Root: 9 | sad | |
| Base 2 | 0b1010001 (7 digits) | ||
| Digit Sum: 0b11 | Digital Root: 0b1 | always happy | |
| Base 8 | 0121 (3 digits) | ||
| Digit Sum: 04 | Digital Root: 04 | sad | |
| Base 16 | 0x51 (2 digits) | ||
| Digit Sum: 0x6 | Digital Root: 0x6 | sad | |
More about this number at Positiv Integers and Number Empire.
The number is not a prime.
Its 4 (1 unique) factors are:
34 = 81
Its 5 divisors are:
1
3
9
27
81
Its aliquote sum is:
40
makeing it a
deficient
number.
| In HTML this number represents this color: |
⇧↑⇧↑⇧↑ #000051 ⇩↓⇩↓⇩↓ |
As Unicode codepoint (since version 1.1) this number represents this character:Q LATIN CAPITAL LETTER Q in ASCII (Source: https://ucdapi.org/unicode/latest/codepoint/dec/81); HTML: Q
In the work of Johann Sebastian Bach BWV 81 is Jesus schläft, was soll ich hoffen
The number appears at position 67 of the decimal digits of π surrounded by
751058209749445923078164062862089986280348 Source: The Pi-Search Page
Computations done with Math::BigInt 1.999811 and Math::Pari 2.030523 based on PARI/GP 2.11.3 (elapsed: 955.178ms; cpu: 97.3729999999993ms)