561

561 is an odd composite number composed of three prime numbers multiplied together.

What does the number 561 look like?

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

561 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 561:

3 × 11 × 17

See below for interesting mathematical facts about the number 561 from the Numbermatics database.


Names of 561

  • Cardinal: 561 can be written as Five hundred sixty-one.

Scientific notation

  • Scientific notation: 5.61 × 102

Factors of 561

  • Number of distinct prime factors ω(n): 3
  • Total number of prime factors Ω(n): 3
  • Sum of prime factors: 31

Divisors of 561

  • Number of divisors d(n): 8
  • Complete list of divisors:
  • Sum of all divisors σ(n): 864
  • Sum of proper divisors (its aliquot sum) s(n): 303
  • 561 is a deficient number, because the sum of its proper divisors (303) is less than itself. Its deficiency is 258

Bases of 561

  • Binary: 10001100012
  • Hexadecimal: 0x231
  • Base-36: FL

Squares and roots of 561

  • 561 squared (5612) is 314721
  • 561 cubed (5613) is 176558481
  • The square root of 561 is 23.6854385647
  • The cube root of 561 is 8.2474739741

Scales and comparisons

How big is 561?
  • 561 seconds is equal to 9 minutes, 21 seconds.
  • To count from 1 to 561 would take you about four 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 561 cubic inches would be around 0.7 feet tall.

Recreational maths with 561

  • 561 backwards is 165
  • The number of decimal digits it has is: 3
  • The sum of 561's digits is 12
  • More coming soon!

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The information we have on file for 561 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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