2561

2,561 is an odd composite number composed of two prime numbers multiplied together.

What does the number 2561 look like?

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

2561 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 2561:

13 × 197

See below for interesting mathematical facts about the number 2561 from the Numbermatics database.


Names of 2561

  • Cardinal: 2561 can be written as Two thousand, five hundred sixty-one.

Scientific notation

  • Scientific notation: 2.561 × 103

Factors of 2561

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 210

Divisors of 2561

  • Number of divisors d(n): 4
  • Complete list of divisors:
  • Sum of all divisors σ(n): 2772
  • Sum of proper divisors (its aliquot sum) s(n): 211
  • 2561 is a deficient number, because the sum of its proper divisors (211) is less than itself. Its deficiency is 2350

Bases of 2561

  • Binary: 1010000000012
  • Hexadecimal: 0xA01
  • Base-36: 1Z5

Squares and roots of 2561

  • 2561 squared (25612) is 6558721
  • 2561 cubed (25613) is 16796884481
  • The square root of 2561 is 50.6063237155
  • The cube root of 2561 is 13.6815885665

Scales and comparisons

How big is 2561?
  • 2,561 seconds is equal to 42 minutes, 41 seconds.
  • To count from 1 to 2,561 would take you about forty-two 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 2561 cubic inches would be around 1.1 feet tall.

Recreational maths with 2561

  • 2561 backwards is 1652
  • The number of decimal digits it has is: 4
  • The sum of 2561's digits is 14
  • More coming soon!

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The information we have on file for 2561 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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