# 9721

## 9,721 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 9721 look like?

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

9721 is a prime number. Like all primes (except two), it is an odd number.

## Prime factorization of 9721:

### 9721

See below for interesting mathematical facts about the number 9721 from the Numbermatics database.

### Names of 9721

• Cardinal: 9721 can be written as Nine thousand, seven hundred twenty-one.

### Scientific notation

• Scientific notation: 9.721 × 103

### Factors of 9721

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 9721

### Divisors of 9721

• Number of divisors d(n): 2
• Complete list of divisors:
• Sum of all divisors σ(n): 9722
• Sum of proper divisors (its aliquot sum) s(n): 1
• 9721 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 9720

### Bases of 9721

• Binary: 100101111110012
• Base-36: 7I1

### Squares and roots of 9721

• 9721 squared (97212) is 94497841
• 9721 cubed (97213) is 918613512361
• The square root of 9721 is 98.5951317257
• The cube root of 9721 is 21.3420916729

### Scales and comparisons

How big is 9721?
• 9,721 seconds is equal to 2 hours, 42 minutes, 1 second.
• To count from 1 to 9,721 would take you about two 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 9721 cubic inches would be around 1.8 feet tall.

### Recreational maths with 9721

• 9721 backwards is 1279
• The number of decimal digits it has is: 4
• The sum of 9721's digits is 19
• More coming soon!