1991 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.
Prime factorization of 1991:
11 × 181
See below for interesting mathematical facts about the number 1991 from the Numbermatics database.
Names of 1991
- Cardinal: 1991 can be written as One thousand, nine hundred ninety-one.
- Scientific notation: 1.991 × 103
Factors of 1991
Divisors of 1991
Bases of 1991
- Binary: 111110001112
- Hexadecimal: 0x7C7
- Base-36: 1JB
Squares and roots of 1991
Scales and comparisonsHow big is 1991?
- 1,991 seconds is equal to 33 minutes, 11 seconds.
To count from 1 to 1,991 would take you about thirty-three 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 1991 cubic inches would be around 1 feet tall.
Recreational maths with 1991
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Cite this page
"Number 1991 - Facts about the integer". Numbermatics.com. 2020. Web. 28 February 2020.
Numbermatics. (2020). Number 1991 - Facts about the integer. Retrieved 28 February 2020, from https://numbermatics.com/n/1991/
Numbermatics. 2020. "Number 1991 - Facts about the integer". https://numbermatics.com/n/1991/
The information we have on file for 1991 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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