681

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

What does the number 681 look like?

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

681 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 681:

3 × 227

See below for interesting mathematical facts about the number 681 from the Numbermatics database.


Names of 681

  • Cardinal: 681 can be written as Six hundred eighty-one.

Scientific notation

  • Scientific notation: 6.81 × 102

Factors of 681

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 230

Divisors of 681

  • Number of divisors d(n): 4
  • Complete list of divisors:
  • Sum of all divisors σ(n): 912
  • Sum of proper divisors (its aliquot sum) s(n): 231
  • 681 is a deficient number, because the sum of its proper divisors (231) is less than itself. Its deficiency is 450

Bases of 681

  • Binary: 10101010012
  • Hexadecimal: 0x2A9
  • Base-36: IX

Squares and roots of 681

  • 681 squared (6812) is 463761
  • 681 cubed (6813) is 315821241
  • The square root of 681 is 26.0959767014
  • The cube root of 681 is 8.7979678503

Scales and comparisons

How big is 681?
  • 681 seconds is equal to 11 minutes, 21 seconds.
  • To count from 1 to 681 would take you about five 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 681 cubic inches would be around 0.7 feet tall.

Recreational maths with 681

  • 681 backwards is 186
  • The number of decimal digits it has is: 3
  • The sum of 681's digits is 15
  • More coming soon!

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The information we have on file for 681 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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