List of Numbers
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Properties of the Number 81
- Because 81 is not divisible by 2 ...
- 81 is an odd number
- 81 has parity 1
- 81 is not an even number
- Because 81 can be factored as 3 x 27 ...
- 81 is a composite number
- 81 is not a prime number
Alternative Representations of the Number 81
- Base 2 (binary): 1010001
- Base 8 (octal): 121
- Base 16 (hexadecimal): 51
Divisors of the Number 81
- 81 has 5 positive divisors:
1, 3, 9, 27, 81
- The sum of the positive divisors is 121
- 81 has 4 proper divisors:
1, 3, 9, 27
- The sum of the proper divisors is 40
- 81 is a deficient number since the sum of the proper divisors is less than 81
- 81 is not a perfect number
- 81 is not an abundant number
More Properties of the Number 81
- 81 is a square number (i.e., square of the natural number 9)
- 81 is not a cube number
- 81 is not a palindromic number
- 81 is not a Fibonacci number
- 81 is not a Lucas number
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