813
813 is an odd composite number composed of two prime numbers multiplied together.
813 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 813:
3^{} × 271^{}
See below for interesting mathematical facts about the number 813 from the Numbermatics database.
Names of 813
 Cardinal: 813 can be written as Eight hundred thirteen.
Scientific notation
 Scientific notation: 8.13 × 10^{2}
Factors of 813
Divisors of 813
Bases of 813
 Binary: 1100101101_{2}
 Hexadecimal: 0x32D
 Base36: ML
Squares and roots of 813
Scales and comparisons
How big is 813? 813 seconds is equal to 13 minutes, 33 seconds.

To count from 1 to 813 would take you about six 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 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 813 cubic inches would be around 0.8 feet tall.
Recreational maths with 813
Link to this page
HTML: To link to this page, just copy and paste the link below into your blog, web page or email.
BBCODE: To link to this page in a forum post or comment box, just copy and paste the link code below:
Cite this page
MLA style:
"Number 813  Facts about the integer". Numbermatics.com. 2021. Web. 28 September 2021.
APA style:
Numbermatics. (2021). Number 813  Facts about the integer. Retrieved 28 September 2021, from https://numbermatics.com/n/813/
Chicago style:
Numbermatics. 2021. "Number 813  Facts about the integer". https://numbermatics.com/n/813/
The information we have on file for 813 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!
Keywords: Divisors of 813, math, Factors of 813, curriculum, school, college, exams, university, Prime factorization of 813, STEM, science, technology, engineering, physics, economics, calculator, eight hundred thirteen.