17991

17,991 is an odd composite number composed of two prime numbers multiplied together.

What does the number 17991 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 6 divisors.

17991 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of six divisors.

Prime factorization of 17991:

3² × 1999

(3 × 3 × 1999)

See below for interesting mathematical facts about the number 17991 from the Numbermatics database.

Names of 17991

Cardinal: 17991 can be written as Seventeen thousand, nine hundred ninety-one.

Scientific notation

Scientific notation: 1.7991 × 10⁴

Factors of 17991

Number of distinct prime factors ω(n): 2
Total number of prime factors Ω(n): 3
Sum of prime factors: 2002

Divisors of 17991

Number of divisors d(n): 6
Complete list of divisors:
1 3 9 1999 5997 17991
Sum of all divisors σ(n): 26000
Sum of proper divisors (its aliquot sum) s(n): 8009
17991 is a deficient number, because the sum of its proper divisors (8009) is less than itself. Its deficiency is 9982

Bases of 17991

Binary: 100011001000111₂
Hexadecimal: 0x4647
Base-36: DVR

Squares and roots of 17991

17991 squared (17991²) is 323676081
17991 cubed (17991³) is 5823256373271
The square root of 17991 is 134.1305334367
The cube root of 17991 is 26.2030453115

Scales and comparisons

How big is 17991?

17,991 seconds is equal to 4 hours, 59 minutes, 51 seconds.
To count from 1 to 17,991 would take you about four hours.

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 17991 cubic inches would be around 2.2 feet tall.

Recreational maths with 17991

17991 backwards is 19971
The number of decimal digits it has is: 5
The sum of 17991's digits is 27
More coming soon!

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The information we have on file for 17991 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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