281 is a prime number. Like all primes (except two), it is an odd number.
Prime factorization of 281:
See below for interesting mathematical facts about the number 281 from the Numbermatics database.
Names of 281
- Cardinal: 281 can be written as Two hundred eighty-one.
- Scientific notation: 2.81 × 102
Factors of 281
- Number of distinct prime factors ω(n): 1
- Total number of prime factors Ω(n): 1
- Sum of prime factors: 281
Divisors of 281
- Number of divisors d(n): 2
- Complete list of divisors:
- Sum of all divisors σ(n): 282
- Sum of proper divisors (its aliquot sum) s(n): 1
- 281 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 280
Bases of 281
- Binary: 1000110012
- Hexadecimal: 0x119
- Base-36: 7T
Squares and roots of 281
- 281 squared (2812) is 78961
- 281 cubed (2813) is 22188041
square rootof 281 is 16.7630546143
cube rootof 281 is 6.5499116201
Scales and comparisonsHow big is 281?
- 281 seconds is equal to 4 minutes, 41 seconds.
To count from 1 to 281 would take you about two 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 281 cubic inches would be around 0.5 feet tall.
Recreational maths with 281
- 281 backwards is 182
- 281 is a
twin prime! Its twin is 283
- The number of decimal digits it has is: 3
- The sum of 281's digits is 11
- More coming soon!
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Cite this page
"Number 281 - Facts about the integer". Numbermatics.com. 2020. Web. 19 January 2020.
Numbermatics. (2020). Number 281 - Facts about the integer. Retrieved 19 January 2020, from https://numbermatics.com/n/281/
Numbermatics. 2020. "Number 281 - Facts about the integer". https://numbermatics.com/n/281/
The information we have on file for 281 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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