# 217

## 217 is an odd composite number composed of two prime numbers multiplied together.

What does the number 217 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

217 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

## Prime factorization of 217:

### 7 × 31

See below for interesting mathematical facts about the number 217 from the Numbermatics database.

### Names of 217

• Cardinal: 217 can be written as Two hundred seventeen.

### Scientific notation

• Scientific notation: 2.17 × 102

### Factors of 217

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 38

### Divisors of 217

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 256
• Sum of proper divisors (its aliquot sum) s(n): 39
• 217 is a deficient number, because the sum of its proper divisors (39) is less than itself. Its deficiency is 178

### Bases of 217

• Binary: 110110012
• Base-36: 61

### Squares and roots of 217

• 217 squared (2172) is 47089
• 217 cubed (2173) is 10218313
• The square root of 217 is 14.7309198627
• The cube root of 217 is 6.0092450069

### Scales and comparisons

How big is 217?
• 217 seconds is equal to 3 minutes, 37 seconds.
• To count from 1 to 217 would take you about forty-eight 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 217 cubic inches would be around 0.5 feet tall.

### Recreational maths with 217

• 217 backwards is 712
• The number of decimal digits it has is: 3
• The sum of 217's digits is 10
• More coming soon!