991991

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

What does the number 991991 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 16 divisors.

991991 is an odd composite number. It is composed of four distinct prime numbers multiplied together. It has a total of sixteen divisors.

Prime factorization of 991991:

7 × 11 × 13 × 991

See below for interesting mathematical facts about the number 991991 from the Numbermatics database.

Names of 991991

Cardinal: 991991 can be written as Nine hundred ninety-one thousand, nine hundred ninety-one.

Scientific notation

Scientific notation: 9.91991 × 10⁵

Factors of 991991

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 4
Sum of prime factors: 1022

Divisors of 991991

Number of divisors d(n): 16
Complete list of divisors:
1 7 11 13 77 91 143 991 1001 6937 10901 12883 76307 90181 141713 991991
Sum of all divisors σ(n): 1333248
Sum of proper divisors (its aliquot sum) s(n): 341257
991991 is a deficient number, because the sum of its proper divisors (341257) is less than itself. Its deficiency is 650734

Bases of 991991

Binary: 11110010001011110111₂
Hexadecimal: 0xF22F7
Base-36: L9FB

Squares and roots of 991991

991991 squared (991991²) is 984046144081
991991 cubed (991991³) is 976164918513055271
The square root of 991991 is 995.9874497201
The cube root of 991991 is 99.7323174331

Scales and comparisons

How big is 991991?

991,991 seconds is equal to 1 week, 4 days, 11 hours, 33 minutes, 11 seconds.
To count from 1 to 991,991 would take you about four days!

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 991991 cubic inches would be around 8.3 feet tall.

Recreational maths with 991991

991991 backwards is 199199
The number of decimal digits it has is: 6
The sum of 991991's digits is 38
More coming soon!

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The information we have on file for 991991 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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