91
91 is an odd composite number composed of two prime numbers multiplied together.
91 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 91:
7^{} × 13^{}
See below for interesting mathematical facts about the number 91 from the Numbermatics database.
Names of 91
 Cardinal: 91 can be written as Ninetyone.
Scientific notation
 Scientific notation: 9.1 × 10^{1}
Factors of 91
Divisors of 91
Bases of 91
 Binary: 1011011_{2}
 Hexadecimal: 0x5B
 Base36: 2J
Squares and roots of 91
Scales and comparisons
How big is 91? 91 seconds is equal to 1 minute, 31 seconds.

To count from 1 to 91 would take you about fortyfive seconds.
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 randomlychosen 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 91 cubic inches would be around 0.4 feet tall.
Recreational maths with 91
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The information we have on file for 91 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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