# 681

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

What does the number 681 look like?

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

681 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 681:

### 3 × 227

See below for interesting mathematical facts about the number 681 from the Numbermatics database.

### Names of 681

• Cardinal: 681 can be written as Six hundred eighty-one.

### Scientific notation

• Scientific notation: 6.81 × 102

### Factors of 681

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 230

### Divisors of 681

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 912
• Sum of proper divisors (its aliquot sum) s(n): 231
• 681 is a deficient number, because the sum of its proper divisors (231) is less than itself. Its deficiency is 450

### Bases of 681

• Binary: 10101010012
• Base-36: IX

### Squares and roots of 681

• 681 squared (6812) is 463761
• 681 cubed (6813) is 315821241
• The square root of 681 is 26.0959767014
• The cube root of 681 is 8.7979678503

### Scales and comparisons

How big is 681?
• 681 seconds is equal to 11 minutes, 21 seconds.
• To count from 1 to 681 would take you about five 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 681 cubic inches would be around 0.7 feet tall.

### Recreational maths with 681

• 681 backwards is 186
• The number of decimal digits it has is: 3
• The sum of 681's digits is 15
• More coming soon!