5781

5,781 is an odd composite number composed of three prime numbers multiplied together.

What does the number 5781 look like?

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

5781 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eight divisors.

Prime factorization of 5781:

3 × 41 × 47

See below for interesting mathematical facts about the number 5781 from the Numbermatics database.


Names of 5781

  • Cardinal: 5781 can be written as Five thousand, seven hundred eighty-one.

Scientific notation

  • Scientific notation: 5.781 × 103

Factors of 5781

  • Number of distinct prime factors ω(n): 3
  • Total number of prime factors Ω(n): 3
  • Sum of prime factors: 91

Divisors of 5781

  • Number of divisors d(n): 8
  • Complete list of divisors:
  • Sum of all divisors σ(n): 8064
  • Sum of proper divisors (its aliquot sum) s(n): 2283
  • 5781 is a deficient number, because the sum of its proper divisors (2283) is less than itself. Its deficiency is 3498

Bases of 5781

  • Binary: 10110100101012
  • Hexadecimal: 0x1695
  • Base-36: 4GL

Squares and roots of 5781

  • 5781 squared (57812) is 33419961
  • 5781 cubed (57813) is 193200794541
  • The square root of 5781 is 76.0328876211
  • The cube root of 5781 is 17.9473771717

Scales and comparisons

How big is 5781?
  • 5,781 seconds is equal to 1 hour, 36 minutes, 21 seconds.
  • To count from 1 to 5,781 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 5781 cubic inches would be around 1.5 feet tall.

Recreational maths with 5781

  • 5781 backwards is 1875
  • The number of decimal digits it has is: 4
  • The sum of 5781's digits is 21
  • More coming soon!

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The information we have on file for 5781 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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