129991

129,991 is an odd composite number composed of two prime numbers multiplied together.

What does the number 129991 look like?

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

129991 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 129991:

61 × 2131

See below for interesting mathematical facts about the number 129991 from the Numbermatics database.

Names of 129991

Cardinal: 129991 can be written as One hundred twenty-nine thousand, nine hundred ninety-one.

Scientific notation

Scientific notation: 1.29991 × 10⁵

Factors of 129991

Number of distinct prime factors ω(n): 2
Total number of prime factors Ω(n): 2
Sum of prime factors: 2192

Divisors of 129991

Number of divisors d(n): 4
Complete list of divisors:
1 61 2131 129991
Sum of all divisors σ(n): 132184
Sum of proper divisors (its aliquot sum) s(n): 2193
129991 is a deficient number, because the sum of its proper divisors (2193) is less than itself. Its deficiency is 127798

Bases of 129991

Binary: 11111101111000111₂
Hexadecimal: 0x1FBC7
Base-36: 2SAV

Squares and roots of 129991

129991 squared (129991²) is 16897660081
129991 cubed (129991³) is 2196543731589271
The square root of 129991 is 360.5426465759
The cube root of 129991 is 50.6568011339

Scales and comparisons

How big is 129991?

129,991 seconds is equal to 1 day, 12 hours, 6 minutes, 31 seconds.
To count from 1 to 129,991 would take you about twelve hours.

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 129991 cubic inches would be around 4.2 feet tall.

Recreational maths with 129991

129991 backwards is 199921
The number of decimal digits it has is: 6
The sum of 129991's digits is 31
More coming soon!

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The information we have on file for 129991 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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