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:
1 3 9 11 27 33 81 99 297 891
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
Hexadecimal: 0x37B
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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