# 891

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

What does the number 891 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 10 divisors.

891 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of ten divisors.

## Prime factorization of 891:

### 34 × 11

(3 × 3 × 3 × 3 × 11)

See below for interesting mathematical facts about the number 891 from the Numbermatics database.

### Names of 891

• Cardinal: 891 can be written as Eight hundred ninety-one.

### Scientific notation

• Scientific notation: 8.91 × 102

### Factors of 891

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 14

### Divisors of 891

• Number of divisors d(n): 10
• Complete list of divisors:
• Sum of all divisors σ(n): 1452
• Sum of proper divisors (its aliquot sum) s(n): 561
• 891 is a deficient number, because the sum of its proper divisors (561) is less than itself. Its deficiency is 330

### Bases of 891

• Binary: 11011110112
• Base-36: OR

### Squares and roots of 891

• 891 squared (8912) is 793881
• 891 cubed (8913) is 707347971
• The square root of 891 is 29.8496231132
• The cube root of 891 is 9.6226029899

### Scales and comparisons

How big is 891?
• 891 seconds is equal to 14 minutes, 51 seconds.
• To count from 1 to 891 would take you about seven 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 891 cubic inches would be around 0.8 feet tall.

### Recreational maths with 891

• 891 backwards is 198
• The number of decimal digits it has is: 3
• The sum of 891's digits is 18
• More coming soon!

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The information we have on file for 891 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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