# 851

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

What does the number 851 look like?

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

851 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 851:

### 23 × 37

See below for interesting mathematical facts about the number 851 from the Numbermatics database.

### Names of 851

• Cardinal: 851 can be written as Eight hundred fifty-one.

### Scientific notation

• Scientific notation: 8.51 × 102

### Factors of 851

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 60

### Divisors of 851

• 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): 61
• 851 is a deficient number, because the sum of its proper divisors (61) is less than itself. Its deficiency is 790

### Bases of 851

• Binary: 11010100112
• Base-36: NN

### Squares and roots of 851

• 851 squared (8512) is 724201
• 851 cubed (8513) is 616295051
• The square root of 851 is 29.1719042917
• The cube root of 851 is 9.4763956935

### Scales and comparisons

How big is 851?
• 851 seconds is equal to 14 minutes, 11 seconds.
• To count from 1 to 851 would take you about seven 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 851 cubic inches would be around 0.8 feet tall.

### Recreational maths with 851

• 851 backwards is 158
• The number of decimal digits it has is: 3
• The sum of 851's digits is 14
• More coming soon!