# 291

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

What does the number 291 look like?

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

291 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 291:

### 3 × 97

See below for interesting mathematical facts about the number 291 from the Numbermatics database.

### Names of 291

• Cardinal: 291 can be written as Two hundred ninety-one.

### Scientific notation

• Scientific notation: 2.91 × 102

### Factors of 291

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 100

### Divisors of 291

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 392
• Sum of proper divisors (its aliquot sum) s(n): 101
• 291 is a deficient number, because the sum of its proper divisors (101) is less than itself. Its deficiency is 190

### Bases of 291

• Binary: 1001000112
• Base-36: 83

### Squares and roots of 291

• 291 squared (2912) is 84681
• 291 cubed (2913) is 24642171
• The square root of 291 is 17.0587221093
• The cube root of 291 is 6.6267053875

### Scales and comparisons

How big is 291?
• 291 seconds is equal to 4 minutes, 51 seconds.
• To count from 1 to 291 would take you about two 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 291 cubic inches would be around 0.6 feet tall.

### Recreational maths with 291

• 291 backwards is 192
• The number of decimal digits it has is: 3
• The sum of 291's digits is 12
• More coming soon!