99 is an odd composite number composed of two prime numbers multiplied together.

What does the number 99 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 6 divisors.

99 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of six divisors.

Prime factorization of 99:

32 × 11

(3 × 3 × 11)

See below for interesting mathematical facts about the number 99 from the Numbermatics database.

Names of 99

  • Cardinal: 99 can be written as Ninety-nine.

Scientific notation

  • Scientific notation: 9.9 × 101

Factors of 99

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 3
  • Sum of prime factors: 14

Divisors of 99

  • Number of divisors d(n): 6
  • Complete list of divisors:
    1 3 9 11 33 99
  • Sum of all divisors σ(n): 156
  • Sum of proper divisors (its aliquot sum) s(n): 57
  • 99 is a deficient number, because the sum of its proper divisors (57) is less than itself. Its deficiency is 42

Bases of 99

  • Binary: 11000112
  • Hexadecimal: 0x63
  • Base-36: 2R

Squares and roots of 99

  • 99 squared (992) is 9801
  • 99 cubed (993) is 970299
  • The square root of 99 is 9.9498743707
  • The cube root of 99 is 4.6260650091

Scales and comparisons

How big is 99?
  • 99 seconds is equal to 1 minute, 39 seconds.
  • To count from 1 to 99 would take you about forty-nine seconds.

    This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

  • A cube with a volume of 99 cubic inches would be around 0.4 feet tall.

Recreational maths with 99

  • 99 is the same when its digits are reversed! That makes it a palindromic number.
  • The number of decimal digits it has is: 2
  • The sum of 99's digits is 18
  • More coming soon!

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"Number 99 - Facts about the integer". Numbermatics.com. 2024. Web. 5 March 2024.

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The information we have on file for 99 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!

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