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17 in words

17

seventeen

17 is written seventeen.

Ways to write it

As an ordinal: seventeenth
Roman numeral: XVII
Expanded form: 10 + 7

Place value

Place	Digit	Value
tens	1	10
ones	7	7

Number facts

Even or odd: Odd
Prime or composite: Prime
Factors: 1 and 17 (2 factors)
First 10 multiples: 17, 34, 51, 68, 85, 102, 119, 136, 153, 170
Square: 17 × 17 = 289
Square root: ≈ 4.12
Sum of the digits: 1 + 7 = 8
Rounded to the nearest 10: 20
Number before: 16
Number after: 18
In binary: 10001

Quick check

What number comes just after 17?
Show the answer
18
Is 17 even or odd?
Show the answer
Odd
What is 17 + 10?
Show the answer
27

Practise 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

Practise any times table from 2× to 12×.

Frequently asked questions

How do you write 17 in words?

17 is written "seventeen".

Is 17 a prime number?

Yes. 17 is a prime number: its only factors are 1 and 17.

What are the factors of 17?

The factors of 17 are 1 and 17.

How do you write 17 in Roman numerals?

17 in Roman numerals is XVII.