991 is a prime number. Like all primes (except two), it is an odd number.
Prime factorization of 991:
See below for interesting mathematical facts about the number 991 from the Numbermatics database.
Names of 991
- Cardinal: 991 can be written as Nine hundred ninety-one.
- Scientific notation: 9.91 × 102
Factors of 991
Divisors of 991
Bases of 991
- Binary: 11110111112
- Hexadecimal: 0x3DF
- Base-36: RJ
Squares and roots of 991
Scales and comparisonsHow big is 991?
- 991 seconds is equal to 16 minutes, 31 seconds.
To count from 1 to 991 would take you about eight 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 991 cubic inches would be around 0.8 feet tall.
Recreational maths with 991
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Cite this page
"Number 991 - Facts about the integer". Numbermatics.com. 2021. Web. 13 May 2021.
Numbermatics. (2021). Number 991 - Facts about the integer. Retrieved 13 May 2021, from https://numbermatics.com/n/991/
Numbermatics. 2021. "Number 991 - Facts about the integer". https://numbermatics.com/n/991/
The information we have on file for 991 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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