# 691

## 691 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 691 look like?

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

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

## Prime factorization of 691:

### 691

See below for interesting mathematical facts about the number 691 from the Numbermatics database.

### Names of 691

• Cardinal: 691 can be written as Six hundred ninety-one.

### Scientific notation

• Scientific notation: 6.91 × 102

### Factors of 691

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 691

### Divisors of 691

• Number of divisors d(n): 2
• Complete list of divisors:
• Sum of all divisors σ(n): 692
• Sum of proper divisors (its aliquot sum) s(n): 1
• 691 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 690

### Bases of 691

• Binary: 10101100112
• Base-36: J7

### Squares and roots of 691

• 691 squared (6912) is 477481
• 691 cubed (6913) is 329939371
• The square root of 691 is 26.2868788563
• The cube root of 691 is 8.8408227295

### Scales and comparisons

How big is 691?
• 691 seconds is equal to 11 minutes, 31 seconds.
• To count from 1 to 691 would take you about five 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 691 cubic inches would be around 0.7 feet tall.

### Recreational maths with 691

• 691 backwards is 196
• The number of decimal digits it has is: 3
• The sum of 691's digits is 16
• More coming soon!

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"Number 691 - Facts about the integer". Numbermatics.com. 2023. Web. 31 March 2023.

APA style:
Numbermatics. (2023). Number 691 - Facts about the integer. Retrieved 31 March 2023, from https://numbermatics.com/n/691/

Chicago style:
Numbermatics. 2023. "Number 691 - Facts about the integer". https://numbermatics.com/n/691/

The information we have on file for 691 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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