181 is a prime number. Like all primes greater than two, it is odd and has no factors apart from itself and one.

What does the number 181 look like?

As a prime, it is not composed of any other numbers and has no internal structure.

181 is a prime number. Like all primes (except two), it is an odd number.

Prime factorization of 181:


See below for interesting mathematical facts about the number 181 from the Numbermatics database.

Names of 181

  • Cardinal: 181 can be written as One hundred eighty-one.

Scientific notation

  • Scientific notation: 1.81 × 102

Factors of 181

  • Number of distinct prime factors ω(n): 1
  • Total number of prime factors Ω(n): 1
  • Sum of prime factors: 181

Divisors of 181

  • Number of divisors d(n): 2
  • Complete list of divisors:
    1 181
  • Sum of all divisors σ(n): 182
  • Sum of proper divisors (its aliquot sum) s(n): 1
  • 181 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 180

Bases of 181

  • Binary: 101101012
  • Hexadecimal: 0xB5
  • Base-36: 51

Squares and roots of 181

  • 181 squared (1812) is 32761
  • 181 cubed (1813) is 5929741
  • The square root of 181 is 13.4536240471
  • The cube root of 181 is 5.6566528259

Scales and comparisons

How big is 181?
  • 181 seconds is equal to 3 minutes, 1 second.
  • To count from 1 to 181 would take you about thirty seconds.

    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 181 cubic inches would be around 0.5 feet tall.

Recreational maths with 181

  • 181 is the same when its digits are reversed! That makes it a palindromic prime number.
  • The number of decimal digits it has is: 3
  • The sum of 181's digits is 10
  • More coming soon!

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The information we have on file for 181 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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