Number
-45
- Negative
- Odd
- 2 digits
-45 is an odd 2-digit integer and the negative of 45. It has 6 divisors and a digital root of 9.
Number properties
ParityOddnot divisible by 2
SignNegative
Absolute value45
Digit count2
Digit sum9
Digital root9repeated digit sum
PalindromicNoreads differently backwards
Factors & divisors
Prime factorisation−1 × 3^2 × 5
Distinct prime factors23, 5
Number of divisors6
Sum of divisors σ(n)78
SquarefreeNohas a repeated prime factor
All divisors1, 3, 5, 9, 15, 456 in total
Arithmetic
Representations
Decimal-45
Binary1011016 bits
Octal55
Hexadecimal2D
Base 3619
In wordsminus forty-five
Ordinalminus forty-fifth
Scientific notation-4.5 × 10^1
Engineering notation-45
Powers & multiples
-45 to the power 22,025
-45 to the power 3-91,125
-45 to the power 44,100,625
-45 to the power 5-184,528,125
First ten multiples-45, -90, -135, -180, -225, -270, -315, -360, -405, -450
Powers of twoBetween 2^5 (32) and 2^6 (64)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3Yes
Divisible by 4No, remainder 1
Divisible by 5Yes
Divisible by 6No, remainder 3
Divisible by 7No, remainder 3
Divisible by 8No, remainder 5
Divisible by 9Yes
Divisible by 10No, remainder 5
Divisible by 11No, remainder 1
Divisible by 12No, remainder 9
Divisible by 100No, remainder 45
As a percentage & fraction
As a percentage-4,500%
-45% as a decimal-0.45
-45% of 100-45
-45% of 1,000-450
As a fraction of 100-45/100
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