# 811

## 811 is a prime number. Like all primes greater than two, it is odd and has no factors apart from itself and one.

What does the number 811 look like?

As a prime, it is not composed of any other numbers and has no internal structure.

811 is a prime number. Like all primes (except two), it is an odd number.

## Prime factorization of 811:

### 811

See below for interesting mathematical facts about the number 811 from the Numbermatics database.

### Names of 811

• Cardinal: 811 can be written as Eight hundred eleven.

### Scientific notation

• Scientific notation: 8.11 × 102

### Factors of 811

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 811

### Divisors of 811

• Number of divisors d(n): 2
• Complete list of divisors:
• Sum of all divisors σ(n): 812
• Sum of proper divisors (its aliquot sum) s(n): 1
• 811 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 810

### Bases of 811

• Binary: 11001010112
• Base-36: MJ

### Squares and roots of 811

• 811 squared (8112) is 657721
• 811 cubed (8113) is 533411731
• The square root of 811 is 28.4780617317
• The cube root of 811 is 9.3255320299

### Scales and comparisons

How big is 811?
• 811 seconds is equal to 13 minutes, 31 seconds.
• To count from 1 to 811 would take you about six 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 811 cubic inches would be around 0.8 feet tall.

### Recreational maths with 811

• 811 backwards is 118
• The number of decimal digits it has is: 3
• The sum of 811's digits is 10
• More coming soon!