# 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:
• 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
• 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!