Number

-13

Negative
Odd
2 digits

-13 is an odd 2-digit integer and the negative of 13. It has 2 divisors and a digital root of 4.

Number properties

ParityOddnot divisible by 2

SignNegative

Absolute value13

Digit count2

Digit sum4

Digital root4repeated digit sum

PalindromicNoreads differently backwards

Factors & divisors

Prime factorisation−1 × 13

Distinct prime factors113

Number of divisors2

Sum of divisors σ(n)14

SquarefreeYesno repeated prime factor

All divisors1, 132 in total

Arithmetic

Previous number-14

Next number-12

Double-26

Half-6.5

Square169

Cube-2,197

Cube root-2.351334688≈

Negation13

Reciprocal-0.0769230769≈

Representations

Decimal-13

Binary11014 bits

Octal15

HexadecimalD

Base 36D

In wordsminus thirteen

Ordinalminus thirteenth

Scientific notation-1.3 × 10^1

Engineering notation-13

Nearest landmarks

Next prime2+15

Nearest square below9

Nearest square above16

Powers & multiples

-13 to the power 2169

-13 to the power 3-2,197

-13 to the power 428,561

-13 to the power 5-371,293

First ten multiples-13, -26, -39, -52, -65, -78, -91, -104, -117, -130

Powers of twoBetween 2^3 (8) and 2^4 (16)

Divisibility tests

Divisible by 2No, remainder 1

Divisible by 3No, remainder 1

Divisible by 4No, remainder 1

Divisible by 5No, remainder 3

Divisible by 6No, remainder 1

Divisible by 7No, remainder 6

Divisible by 8No, remainder 5

Divisible by 9No, remainder 4

Divisible by 10No, remainder 3

Divisible by 11No, remainder 2

Divisible by 12No, remainder 1

Divisible by 100No, remainder 13

As a percentage & fraction

As a percentage-1,300%

-13% as a decimal-0.13

-13% of 100-13

-13% of 1,000-130

As a fraction of 100-13/100

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Derived from -13

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