Number
-15
- Negative
- Odd
- 2 digits
-15 is an odd 2-digit integer and the negative of 15. It has 4 divisors and a digital root of 6.
Number properties
ParityOddnot divisible by 2
SignNegative
Absolute value15
Digit count2
Digit sum6
Digital root6repeated digit sum
PalindromicNoreads differently backwards
Factors & divisors
Prime factorisation−1 × 3 × 5
Distinct prime factors23, 5
Number of divisors4
Sum of divisors σ(n)24
SquarefreeYesno repeated prime factor
All divisors1, 3, 5, 154 in total
Arithmetic
Representations
Decimal-15
Binary11114 bits
Octal17
HexadecimalF
Base 36F
In wordsminus fifteen
Ordinalminus fifteenth
Scientific notation-1.5 × 10^1
Engineering notation-15
Powers & multiples
-15 to the power 2225
-15 to the power 3-3,375
-15 to the power 450,625
-15 to the power 5-759,375
First ten multiples-15, -30, -45, -60, -75, -90, -105, -120, -135, -150
Powers of twoBetween 2^3 (8) and 2^4 (16)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3Yes
Divisible by 4No, remainder 3
Divisible by 5Yes
Divisible by 6No, remainder 3
Divisible by 7No, remainder 1
Divisible by 8No, remainder 7
Divisible by 9No, remainder 6
Divisible by 10No, remainder 5
Divisible by 11No, remainder 4
Divisible by 12No, remainder 3
Divisible by 100No, remainder 15
As a percentage & fraction
As a percentage-1,500%
-15% as a decimal-0.15
-15% of 100-15
-15% of 1,000-150
As a fraction of 100-15/100
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