13 is a prime number. Like all primes greater than two, it is odd and has no factors apart from itself and one.

What does the number 13 look like?

As a prime, it is not composed of any other numbers and has no internal structure.

13 is a prime number. Like all primes (except two), it is an odd number.

Prime factorization of 13:


See below for interesting mathematical facts about the number 13 from the Numbermatics database.

Names of 13

  • Cardinal: 13 can be written as Thirteen.

Scientific notation

  • Scientific notation: 1.3 × 101

Factors of 13

  • Number of distinct prime factors ω(n): 1
  • Total number of prime factors Ω(n): 1
  • Sum of prime factors: 13

Divisors of 13

  • Number of divisors d(n): 2
  • Complete list of divisors:
    1 13
  • Sum of all divisors σ(n): 14
  • Sum of proper divisors (its aliquot sum) s(n): 1
  • 13 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 12

Bases of 13

  • Binary: 11012
  • Hexadecimal: 0xD
  • Base-36: D

Squares and roots of 13

  • 13 squared (132) is 169
  • 13 cubed (133) is 2197
  • The square root of 13 is 3.6055512755
  • The cube root of 13 is 2.3513346877

Scales and comparisons

How big is 13?
  • A cube with a volume of 13 cubic inches would be around 0.2 feet tall.

Recreational maths with 13

  • 13 backwards is 31
  • The number of decimal digits it has is: 2
  • The sum of 13's digits is 4
  • More coming soon!

Copy this link to share with anyone:

Share this page on social media:

Link to this page

HTML: To link to this page, just copy and paste the link below into your blog, web page or email.

BBCODE: To link to this page in a forum post or comment box, just copy and paste the link code below:

Cite this page

MLA style:
"Number 13 - Facts about the integer". Numbermatics.com. 2024. Web. 17 July 2024.

APA style:
Numbermatics. (2024). Number 13 - Facts about the integer. Retrieved 17 July 2024, from https://numbermatics.com/n/13/

Chicago style:
Numbermatics. 2024. "Number 13 - Facts about the integer". https://numbermatics.com/n/13/

The information we have on file for 13 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

Keywords: Divisors of 13, math, Factors of 13, curriculum, school, college, exams, university, Prime factorization of 13, STEM, science, technology, engineering, physics, economics, calculator, thirteen.

Oh no. Javascript is switched off in your browser.
Some bits of this website may not work unless you switch it on.