# 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!