# 225

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

What does the number 225 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 9 divisors.

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

## Prime factorization of 225:

### 32 × 52

(3 × 3 × 5 × 5)

See below for interesting mathematical facts about the number 225 from the Numbermatics database.

### Names of 225

• Cardinal: 225 can be written as Two hundred twenty-five.

### Scientific notation

• Scientific notation: 2.25 × 102

### Factors of 225

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 8

### Divisors of 225

• Number of divisors d(n): 9
• Complete list of divisors:
• Sum of all divisors σ(n): 403
• Sum of proper divisors (its aliquot sum) s(n): 178
• 225 is a deficient number, because the sum of its proper divisors (178) is less than itself. Its deficiency is 47

### Bases of 225

• Binary: 111000012
• Base-36: 69

### Squares and roots of 225

• 225 squared (2252) is 50625
• 225 cubed (2253) is 11390625
• 225 is a perfect square number. Its square root is 15
• The cube root of 225 is 6.0822019955

### Scales and comparisons

How big is 225?
• 225 seconds is equal to 3 minutes, 45 seconds.
• To count from 1 to 225 would take you about fifty-two 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 225 cubic inches would be around 0.5 feet tall.

### Recreational maths with 225

• 225 backwards is 522
• 225 is a Harshad number.
• The number of decimal digits it has is: 3
• The sum of 225's digits is 9
• More coming soon!