# 8181

## 8,181 is an odd composite number composed of two prime numbers multiplied together.

What does the number 8181 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 10 divisors.

8181 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of ten divisors.

## Prime factorization of 8181:

### 34 × 101

(3 × 3 × 3 × 3 × 101)

See below for interesting mathematical facts about the number 8181 from the Numbermatics database.

### Names of 8181

• Cardinal: 8181 can be written as Eight thousand, one hundred eighty-one.

### Scientific notation

• Scientific notation: 8.181 × 103

### Factors of 8181

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 104

### Divisors of 8181

• Number of divisors d(n): 10
• Complete list of divisors:
• Sum of all divisors σ(n): 12342
• Sum of proper divisors (its aliquot sum) s(n): 4161
• 8181 is a deficient number, because the sum of its proper divisors (4161) is less than itself. Its deficiency is 4020

### Bases of 8181

• Binary: 11111111101012
• Base-36: 6B9

### Squares and roots of 8181

• 8181 squared (81812) is 66928761
• 8181 cubed (81813) is 547544193741
• The square root of 8181 is 90.4488805901
• The cube root of 8181 is 20.1497098847

### Scales and comparisons

How big is 8181?
• 8,181 seconds is equal to 2 hours, 16 minutes, 21 seconds.
• To count from 1 to 8,181 would take you about two hours.

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 8181 cubic inches would be around 1.7 feet tall.

### Recreational maths with 8181

• 8181 backwards is 1818
• The number of decimal digits it has is: 4
• The sum of 8181's digits is 18
• More coming soon!