# 2991

## 2,991 is an odd composite number composed of two prime numbers multiplied together.

What does the number 2991 look like?

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

2991 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 2991:

### 3 × 997

See below for interesting mathematical facts about the number 2991 from the Numbermatics database.

### Names of 2991

• Cardinal: 2991 can be written as Two thousand, nine hundred ninety-one.

### Scientific notation

• Scientific notation: 2.991 × 103

### Factors of 2991

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 1000

### Divisors of 2991

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 3992
• Sum of proper divisors (its aliquot sum) s(n): 1001
• 2991 is a deficient number, because the sum of its proper divisors (1001) is less than itself. Its deficiency is 1990

### Bases of 2991

• Binary: 1011101011112
• Base-36: 2B3

### Squares and roots of 2991

• 2991 squared (29912) is 8946081
• 2991 cubed (29913) is 26757728271
• The square root of 2991 is 54.6900356555
• The cube root of 2991 is 14.4080587607

### Scales and comparisons

How big is 2991?
• 2,991 seconds is equal to 49 minutes, 51 seconds.
• To count from 1 to 2,991 would take you about forty-nine 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 2991 cubic inches would be around 1.2 feet tall.

### Recreational maths with 2991

• 2991 backwards is 1992
• The number of decimal digits it has is: 4
• The sum of 2991's digits is 21
• More coming soon!