# 12391

## 12,391 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 12391 look like?

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

12391 is a prime number. Like all primes (except two), it is an odd number.

## Prime factorization of 12391:

### 12391

See below for interesting mathematical facts about the number 12391 from the Numbermatics database.

### Names of 12391

• Cardinal: 12391 can be written as Twelve thousand, three hundred ninety-one.

### Scientific notation

• Scientific notation: 1.2391 × 104

### Factors of 12391

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 12391

### Divisors of 12391

• Number of divisors d(n): 2
• Complete list of divisors:
• Sum of all divisors σ(n): 12392
• Sum of proper divisors (its aliquot sum) s(n): 1
• 12391 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 12390

### Bases of 12391

• Binary: 110000011001112
• Hexadecimal: 0x3067
• Base-36: 9K7

### Squares and roots of 12391

• 12391 squared (123912) is 153536881
• 12391 cubed (123913) is 1902475492471
• The square root of 12391 is 111.3148687283
• The cube root of 12391 is 23.1402893775

### Scales and comparisons

How big is 12391?
• 12,391 seconds is equal to 3 hours, 26 minutes, 31 seconds.
• To count from 1 to 12,391 would take you about three hours.

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 12391 cubic inches would be around 1.9 feet tall.

### Recreational maths with 12391

• 12391 backwards is 19321
• The number of decimal digits it has is: 5
• The sum of 12391's digits is 16
• More coming soon!

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"Number 12391 - Facts about the integer". Numbermatics.com. 2023. Web. 7 June 2023.

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Numbermatics. (2023). Number 12391 - Facts about the integer. Retrieved 7 June 2023, from https://numbermatics.com/n/12391/

Chicago style:
Numbermatics. 2023. "Number 12391 - Facts about the integer". https://numbermatics.com/n/12391/

The information we have on file for 12391 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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