1521

1,521 is an odd composite number composed of two prime numbers multiplied together.

What does the number 1521 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 9 divisors.

1521 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of nine divisors.

Prime factorization of 1521:

32 × 132

(3 × 3 × 13 × 13)

See below for interesting mathematical facts about the number 1521 from the Numbermatics database.


Names of 1521

  • Cardinal: 1521 can be written as One thousand, five hundred twenty-one.

Scientific notation

  • Scientific notation: 1.521 × 103

Factors of 1521

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 4
  • Sum of prime factors: 16

Divisors of 1521

  • Number of divisors d(n): 9
  • Complete list of divisors:
  • Sum of all divisors σ(n): 2379
  • Sum of proper divisors (its aliquot sum) s(n): 858
  • 1521 is a deficient number, because the sum of its proper divisors (858) is less than itself. Its deficiency is 663

Bases of 1521

  • Binary: 101111100012
  • Hexadecimal: 0x5F1
  • Base-36: 169

Squares and roots of 1521

  • 1521 squared (15212) is 2313441
  • 1521 cubed (15213) is 3518743761
  • 1521 is a perfect square number. Its square root is 39
  • The cube root of 1521 is 11.5003150513

Scales and comparisons

How big is 1521?
  • 1,521 seconds is equal to 25 minutes, 21 seconds.
  • To count from 1 to 1,521 would take you about twenty-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 1521 cubic inches would be around 1 feet tall.

Recreational maths with 1521

  • 1521 backwards is 1251
  • 1521 is a Harshad number.
  • The number of decimal digits it has is: 4
  • The sum of 1521's digits is 9
  • More coming soon!

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"Number 1521 - Facts about the integer". Numbermatics.com. 2020. Web. 11 August 2020.

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Numbermatics. (2020). Number 1521 - Facts about the integer. Retrieved 11 August 2020, from https://numbermatics.com/n/1521/

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The information we have on file for 1521 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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