Number
-31
- Negative
- Odd
- 2 digits
-31 is an odd 2-digit integer and the negative of 31. It has 2 divisors and a digital root of 4.
Number properties
ParityOddnot divisible by 2
SignNegative
Absolute value31
Digit count2
Digit sum4
Digital root4repeated digit sum
PalindromicNoreads differently backwards
Factors & divisors
Prime factorisation−1 × 31
Distinct prime factors131
Number of divisors2
Sum of divisors σ(n)32
SquarefreeYesno repeated prime factor
All divisors1, 312 in total
Arithmetic
Representations
Decimal-31
Binary111115 bits
Octal37
Hexadecimal1F
Base 36V
In wordsminus thirty-one
Ordinalminus thirty-first
Scientific notation-3.1 × 10^1
Engineering notation-31
Powers & multiples
-31 to the power 2961
-31 to the power 3-29,791
-31 to the power 4923,521
-31 to the power 5-28,629,151
First ten multiples-31, -62, -93, -124, -155, -186, -217, -248, -279, -310
Powers of twoBetween 2^4 (16) and 2^5 (32)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 1
Divisible by 4No, remainder 3
Divisible by 5No, remainder 1
Divisible by 6No, remainder 1
Divisible by 7No, remainder 3
Divisible by 8No, remainder 7
Divisible by 9No, remainder 4
Divisible by 10No, remainder 1
Divisible by 11No, remainder 9
Divisible by 12No, remainder 7
Divisible by 100No, remainder 31
As a percentage & fraction
As a percentage-3,100%
-31% as a decimal-0.31
-31% of 100-31
-31% of 1,000-310
As a fraction of 100-31/100
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