381

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

What does the number 381 look like?

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

381 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 381:

3 × 127

See below for interesting mathematical facts about the number 381 from the Numbermatics database.


Names of 381

  • Cardinal: 381 can be written as Three hundred eighty-one.

Scientific notation

  • Scientific notation: 3.81 × 102

Factors of 381

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 130

Divisors of 381

  • Number of divisors d(n): 4
  • Complete list of divisors:
  • Sum of all divisors σ(n): 512
  • Sum of proper divisors (its aliquot sum) s(n): 131
  • 381 is a deficient number, because the sum of its proper divisors (131) is less than itself. Its deficiency is 250

Bases of 381

  • Binary: 1011111012
  • Hexadecimal: 0x17D
  • Base-36: AL

Squares and roots of 381

  • 381 squared (3812) is 145161
  • 381 cubed (3813) is 55306341
  • The square root of 381 is 19.5192212959
  • The cube root of 381 is 7.2495045243

Scales and comparisons

How big is 381?
  • 381 seconds is equal to 6 minutes, 21 seconds.
  • To count from 1 to 381 would take you about three 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 381 cubic inches would be around 0.6 feet tall.

Recreational maths with 381

  • 381 backwards is 183
  • The number of decimal digits it has is: 3
  • The sum of 381's digits is 12
  • More coming soon!

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Numbermatics. (2020). Number 381 - Facts about the integer. Retrieved 28 November 2020, from https://numbermatics.com/n/381/

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The information we have on file for 381 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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