# 1721

## 1,721 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 1721 look like?

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

1721 is a prime number. Like all primes (except two), it is an odd number.

## Prime factorization of 1721:

### 1721

See below for interesting mathematical facts about the number 1721 from the Numbermatics database.

### Names of 1721

• Cardinal: 1721 can be written as One thousand, seven hundred twenty-one.

### Scientific notation

• Scientific notation: 1.721 × 103

### Factors of 1721

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 1721

### Divisors of 1721

• Number of divisors d(n): 2
• Complete list of divisors:
• Sum of all divisors σ(n): 1722
• Sum of proper divisors (its aliquot sum) s(n): 1
• 1721 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 1720

### Bases of 1721

• Binary: 110101110012
• Base-36: 1BT

### Squares and roots of 1721

• 1721 squared (17212) is 2961841
• 1721 cubed (17213) is 5097328361
• The square root of 1721 is 41.4849370255
• The cube root of 1721 is 11.9837743669

### Scales and comparisons

How big is 1721?
• 1,721 seconds is equal to 28 minutes, 41 seconds.
• To count from 1 to 1,721 would take you about twenty-eight 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 1721 cubic inches would be around 1 feet tall.

### Recreational maths with 1721

• 1721 backwards is 1271
• 1721 is a twin prime! Its twin is 1723
• The number of decimal digits it has is: 4
• The sum of 1721's digits is 11
• More coming soon!