# 491

## 491 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 491 look like?

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

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

## Prime factorization of 491:

### 491

See below for interesting mathematical facts about the number 491 from the Numbermatics database.

### Names of 491

• Cardinal: 491 can be written as Four hundred ninety-one.

### Scientific notation

• Scientific notation: 4.91 × 102

### Factors of 491

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 491

### Divisors of 491

• Number of divisors d(n): 2
• Complete list of divisors:
• Sum of all divisors σ(n): 492
• Sum of proper divisors (its aliquot sum) s(n): 1
• 491 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 490

### Bases of 491

• Binary: 1111010112
• Base-36: DN

### Squares and roots of 491

• 491 squared (4912) is 241081
• 491 cubed (4913) is 118370771
• The square root of 491 is 22.1585198061
• The cube root of 491 is 7.8890946041

### Scales and comparisons

How big is 491?
• 491 seconds is equal to 8 minutes, 11 seconds.
• To count from 1 to 491 would take you about four 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 491 cubic inches would be around 0.7 feet tall.

### Recreational maths with 491

• 491 backwards is 194
• The number of decimal digits it has is: 3
• The sum of 491's digits is 14
• More coming soon!

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The information we have on file for 491 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

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