81138

81,138 is an even composite number composed of three prime numbers multiplied together.

What does the number 81138 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 8 divisors.

81138 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eight divisors.

Prime factorization of 81138:

2 × 3 × 13523

See below for interesting mathematical facts about the number 81138 from the Numbermatics database.


Names of 81138

  • Cardinal: 81138 can be written as Eighty-one thousand, one hundred thirty-eight.

Scientific notation

  • Scientific notation: 8.1138 × 104

Factors of 81138

  • Number of distinct prime factors ω(n): 3
  • Total number of prime factors Ω(n): 3
  • Sum of prime factors: 13528

Divisors of 81138

  • Number of divisors d(n): 8
  • Complete list of divisors:
  • Sum of all divisors σ(n): 162288
  • Sum of proper divisors (its aliquot sum) s(n): 81150
  • 81138 is an abundant number, because the sum of its proper divisors (81150) is greater than itself. Its abundance is 12

Bases of 81138

  • Binary: 100111100111100102
  • Hexadecimal: 0x13CF2
  • Base-36: 1QLU

Squares and roots of 81138

  • 81138 squared (811382) is 6583375044
  • 81138 cubed (811383) is 534161884320072
  • The square root of 81138 is 284.8473275281
  • The cube root of 81138 is 43.2920448275

Scales and comparisons

How big is 81138?
  • 81,138 seconds is equal to 22 hours, 32 minutes, 18 seconds.
  • To count from 1 to 81,138 would take you about twenty-two hours.

    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 81138 cubic inches would be around 3.6 feet tall.

Recreational maths with 81138

  • 81138 backwards is 83118
  • The number of decimal digits it has is: 5
  • The sum of 81138's digits is 21
  • More coming soon!

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The information we have on file for 81138 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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