# 191

## 191 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 191 look like?

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

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

## Prime factorization of 191:

### 191

See below for interesting mathematical facts about the number 191 from the Numbermatics database.

### Names of 191

• Cardinal: 191 can be written as One hundred ninety-one.

### Scientific notation

• Scientific notation: 1.91 × 102

### Factors of 191

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 191

### Divisors of 191

• Number of divisors d(n): 2
• Complete list of divisors:
• Sum of all divisors σ(n): 192
• Sum of proper divisors (its aliquot sum) s(n): 1
• 191 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 190

### Bases of 191

• Binary: 101111112
• Base-36: 5B

### Squares and roots of 191

• 191 squared (1912) is 36481
• 191 cubed (1913) is 6967871
• The square root of 191 is 13.8202749611
• The cube root of 191 is 5.7589652205

### Scales and comparisons

How big is 191?
• 191 seconds is equal to 3 minutes, 11 seconds.
• To count from 1 to 191 would take you about thirty-five seconds.

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 191 cubic inches would be around 0.5 feet tall.

### Recreational maths with 191

• 191 is the same when its digits are reversed! That makes it a palindromic prime number.
• 191 is a twin prime! Its twin is 193
• The number of decimal digits it has is: 3
• The sum of 191's digits is 11
• More coming soon!

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The information we have on file for 191 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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