# 731

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

What does the number 731 look like?

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

731 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 731:

### 17 × 43

See below for interesting mathematical facts about the number 731 from the Numbermatics database.

### Names of 731

• Cardinal: 731 can be written as Seven hundred thirty-one.

### Scientific notation

• Scientific notation: 7.31 × 102

### Factors of 731

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 60

### Divisors of 731

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 792
• Sum of proper divisors (its aliquot sum) s(n): 61
• 731 is a deficient number, because the sum of its proper divisors (61) is less than itself. Its deficiency is 670

### Bases of 731

• Binary: 10110110112
• Base-36: KB

### Squares and roots of 731

• 731 squared (7312) is 534361
• 731 cubed (7313) is 390617891
• The square root of 731 is 27.0370116691
• The cube root of 731 is 9.0082229371

### Scales and comparisons

How big is 731?
• 731 seconds is equal to 12 minutes, 11 seconds.
• To count from 1 to 731 would take you about six 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 731 cubic inches would be around 0.8 feet tall.

### Recreational maths with 731

• 731 backwards is 137
• The number of decimal digits it has is: 3
• The sum of 731's digits is 11
• More coming soon!