1391

1,391 is an odd composite number composed of two prime numbers multiplied together.

What does the number 1391 look like?

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

1391 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 1391:

13 × 107

See below for interesting mathematical facts about the number 1391 from the Numbermatics database.


Names of 1391

  • Cardinal: 1391 can be written as One thousand, three hundred ninety-one.

Scientific notation

  • Scientific notation: 1.391 × 103

Factors of 1391

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 120

Divisors of 1391

  • Number of divisors d(n): 4
  • Complete list of divisors:
  • Sum of all divisors σ(n): 1512
  • Sum of proper divisors (its aliquot sum) s(n): 121
  • 1391 is a deficient number, because the sum of its proper divisors (121) is less than itself. Its deficiency is 1270

Bases of 1391

  • Binary: 101011011112
  • Hexadecimal: 0x56F
  • Base-36: 12N

Squares and roots of 1391

  • 1391 squared (13912) is 1934881
  • 1391 cubed (13913) is 2691419471
  • The square root of 1391 is 37.2961123981
  • The cube root of 1391 is 11.1628659623

Scales and comparisons

How big is 1391?
  • 1,391 seconds is equal to 23 minutes, 11 seconds.
  • To count from 1 to 1,391 would take you about twenty-three 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 1391 cubic inches would be around 0.9 feet tall.

Recreational maths with 1391

  • 1391 backwards is 1931
  • The number of decimal digits it has is: 4
  • The sum of 1391's digits is 14
  • More coming soon!

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The information we have on file for 1391 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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