1981

1,981 is an odd composite number composed of two prime numbers multiplied together.

What does the number 1981 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

1981 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 1981:

7 × 283

See below for interesting mathematical facts about the number 1981 from the Numbermatics database.

Names of 1981

Cardinal: 1981 can be written as One thousand, nine hundred eighty-one.

Scientific notation

Scientific notation: 1.981 × 10³

Factors of 1981

Number of distinct prime factors ω(n): 2
Total number of prime factors Ω(n): 2
Sum of prime factors: 290

Divisors of 1981

Number of divisors d(n): 4
Complete list of divisors:
1 7 283 1981
Sum of all divisors σ(n): 2272
Sum of proper divisors (its aliquot sum) s(n): 291
1981 is a deficient number, because the sum of its proper divisors (291) is less than itself. Its deficiency is 1690

Bases of 1981

Binary: 11110111101₂
Hexadecimal: 0x7BD
Base-36: 1J1

Squares and roots of 1981

1981 squared (1981²) is 3924361
1981 cubed (1981³) is 7774159141
The square root of 1981 is 44.5084261685
The cube root of 1981 is 12.5591859859

Scales and comparisons

How big is 1981?

1,981 seconds is equal to 33 minutes, 1 second.
To count from 1 to 1,981 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 1981 cubic inches would be around 1 feet tall.

Recreational maths with 1981

1981 backwards is 1891
The number of decimal digits it has is: 4
The sum of 1981's digits is 19
More coming soon!

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The information we have on file for 1981 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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