2,181 is an odd composite number composed of two prime numbers multiplied together.

What does the number 2181 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

2181 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

Prime factorization of 2181:

3 × 727

See below for interesting mathematical facts about the number 2181 from the Numbermatics database.

Names of 2181

  • Cardinal: 2181 can be written as Two thousand, one hundred eighty-one.

Scientific notation

  • Scientific notation: 2.181 × 103

Factors of 2181

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 730

Divisors of 2181

  • Number of divisors d(n): 4
  • Complete list of divisors:
  • Sum of all divisors σ(n): 2912
  • Sum of proper divisors (its aliquot sum) s(n): 731
  • 2181 is a deficient number, because the sum of its proper divisors (731) is less than itself. Its deficiency is 1450

Bases of 2181

  • Binary: 1000100001012
  • Hexadecimal: 0x885
  • Base-36: 1OL

Squares and roots of 2181

  • 2181 squared (21812) is 4756761
  • 2181 cubed (21813) is 10374495741
  • The square root of 2181 is 46.7011777153
  • The cube root of 2181 is 12.9683648939

Scales and comparisons

How big is 2181?
  • 2,181 seconds is equal to 36 minutes, 21 seconds.
  • To count from 1 to 2,181 would take you about thirty-six minutes.

    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 2181 cubic inches would be around 1.1 feet tall.

Recreational maths with 2181

  • 2181 backwards is 1812
  • The number of decimal digits it has is: 4
  • The sum of 2181's digits is 12
  • More coming soon!

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The information we have on file for 2181 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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