155
155 is an odd composite number composed of two prime numbers multiplied together.
155 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 155:
5^{} × 31^{}
See below for interesting mathematical facts about the number 155 from the Numbermatics database.
Names of 155
 Cardinal: 155 can be written as One hundred fiftyfive.
Scientific notation
 Scientific notation: 1.55 × 10^{2}
Factors of 155
Divisors of 155
Bases of 155
 Binary: 10011011_{2}
 Hexadecimal: 0x9B
 Base36: 4B
Squares and roots of 155
Scales and comparisons
How big is 155? 155 seconds is equal to 2 minutes, 35 seconds.

To count from 1 to 155 would take you about seventeen 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 155 cubic inches would be around 0.4 feet tall.
Recreational maths with 155
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The information we have on file for 155 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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