129

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

What does the number 129 look like?

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

129 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 129:

3 × 43

See below for interesting mathematical facts about the number 129 from the Numbermatics database.

Names of 129

Cardinal: 129 can be written as One hundred twenty-nine.

Scientific notation

Scientific notation: 1.29 × 10²

Factors of 129

Number of distinct prime factors ω(n): 2
Total number of prime factors Ω(n): 2
Sum of prime factors: 46

Divisors of 129

Number of divisors d(n): 4
Complete list of divisors:
1 3 43 129
Sum of all divisors σ(n): 176
Sum of proper divisors (its aliquot sum) s(n): 47
129 is a deficient number, because the sum of its proper divisors (47) is less than itself. Its deficiency is 82

Bases of 129

Binary: 10000001₂
Hexadecimal: 0x81
Base-36: 3L

Squares and roots of 129

129 squared (129²) is 16641
129 cubed (129³) is 2146689
The square root of 129 is 11.3578166917
The cube root of 129 is 5.0527743473

Scales and comparisons

How big is 129?

129 seconds is equal to 2 minutes, 9 seconds.
To count from 1 to 129 would take you about four 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 129 cubic inches would be around 0.4 feet tall.

Recreational maths with 129

129 backwards is 921
The number of decimal digits it has is: 3
The sum of 129's digits is 12
More coming soon!

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The information we have on file for 129 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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