# 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:
• 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
• 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!

MLA style:
"Number 1981 - Facts about the integer". Numbermatics.com. 2022. Web. 25 May 2022.

APA style:
Numbermatics. (2022). Number 1981 - Facts about the integer. Retrieved 25 May 2022, from https://numbermatics.com/n/1981/

Chicago style:
Numbermatics. 2022. "Number 1981 - Facts about the integer". https://numbermatics.com/n/1981/

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!

Keywords: Divisors of 1981, math, Factors of 1981, curriculum, school, college, exams, university, Prime factorization of 1981, STEM, science, technology, engineering, physics, economics, calculator, one thousand, nine hundred eighty-one.

Oh no. Javascript is switched off in your browser.
Some bits of this website may not work unless you switch it on.