145

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

What does the number 145 look like?

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

145 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 145:

5 × 29

See below for interesting mathematical facts about the number 145 from the Numbermatics database.


Names of 145

  • Cardinal: 145 can be written as One hundred forty-five.

Scientific notation

  • Scientific notation: 1.45 × 102

Factors of 145

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 34

Divisors of 145

  • Number of divisors d(n): 4
  • Complete list of divisors:
    1 5 29 145
  • Sum of all divisors σ(n): 180
  • Sum of proper divisors (its aliquot sum) s(n): 35
  • 145 is a deficient number, because the sum of its proper divisors (35) is less than itself. Its deficiency is 110

Bases of 145

  • Binary: 100100012
  • Hexadecimal: 0x91
  • Base-36: 41

Squares and roots of 145

  • 145 squared (1452) is 21025
  • 145 cubed (1453) is 3048625
  • The square root of 145 is 12.0415945787
  • The cube root of 145 is 5.2535878725

Scales and comparisons

How big is 145?
  • 145 seconds is equal to 2 minutes, 25 seconds.
  • To count from 1 to 145 would take you about twelve 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 145 cubic inches would be around 0.4 feet tall.

Recreational maths with 145

  • 145 backwards is 541
  • The number of decimal digits it has is: 3
  • The sum of 145's digits is 10
  • More coming soon!

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The information we have on file for 145 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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