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13 in words

13

thirteen

13 is written thirteen.

Ways to write it

As an ordinal: thirteenth
Roman numeral: XIII
Expanded form: 10 + 3

Place value

Place	Digit	Value
tens	1	10
ones	3	3

Number facts

Even or odd: Odd
Prime or composite: Prime
Factors: 1 and 13 (2 factors)
First 10 multiples: 13, 26, 39, 52, 65, 78, 91, 104, 117, 130
Square: 13 × 13 = 169
Square root: ≈ 3.61
Sum of the digits: 1 + 3 = 4
Rounded to the nearest 10: 10
Number before: 12
Number after: 14
In binary: 1101

Quick check

What number comes just after 13?
Show the answer
14
Is 13 even or odd?
Show the answer
Odd
What is 13 + 10?
Show the answer
23

Practice with a game

Count with Me

Count pictures up to 5, 10 or 20 and compare groups.

Place Value Quest

Ones, tens, hundreds and thousands.

Times Tables Challenge

Practice any times table from 2× to 12×.

Frequently asked questions

How do you write 13 in words?

13 is written "thirteen".

Is 13 a prime number?

Yes. 13 is a prime number: its only factors are 1 and 13.

What are the factors of 13?

The factors of 13 are 1 and 13.

How do you write 13 in Roman numerals?

13 in Roman numerals is XIII.