# 381

## 381 is an odd composite number composed of two prime numbers multiplied together.

What does the number 381 look like?

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

381 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 381:

### 3 × 127

See below for interesting mathematical facts about the number 381 from the Numbermatics database.

### Names of 381

• Cardinal: 381 can be written as Three hundred eighty-one.

### Scientific notation

• Scientific notation: 3.81 × 102

### Factors of 381

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 130

### Divisors of 381

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 512
• Sum of proper divisors (its aliquot sum) s(n): 131
• 381 is a deficient number, because the sum of its proper divisors (131) is less than itself. Its deficiency is 250

### Bases of 381

• Binary: 1011111012
• Base-36: AL

### Squares and roots of 381

• 381 squared (3812) is 145161
• 381 cubed (3813) is 55306341
• The square root of 381 is 19.5192212959
• The cube root of 381 is 7.2495045243

### Scales and comparisons

How big is 381?
• 381 seconds is equal to 6 minutes, 21 seconds.
• To count from 1 to 381 would take you about 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 381 cubic inches would be around 0.6 feet tall.

### Recreational maths with 381

• 381 backwards is 183
• The number of decimal digits it has is: 3
• The sum of 381's digits is 12
• More coming soon!