# 245

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

What does the number 245 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 6 divisors.

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

## Prime factorization of 245:

### 5 × 72

(5 × 7 × 7)

See below for interesting mathematical facts about the number 245 from the Numbermatics database.

### Names of 245

• Cardinal: 245 can be written as Two hundred forty-five.

### Scientific notation

• Scientific notation: 2.45 × 102

### Factors of 245

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 12

### Divisors of 245

• Number of divisors d(n): 6
• Complete list of divisors:
• Sum of all divisors σ(n): 342
• Sum of proper divisors (its aliquot sum) s(n): 97
• 245 is a deficient number, because the sum of its proper divisors (97) is less than itself. Its deficiency is 148

### Bases of 245

• Binary: 111101012
• Base-36: 6T

### Squares and roots of 245

• 245 squared (2452) is 60025
• 245 cubed (2453) is 14706125
• The square root of 245 is 15.6524758425
• The cube root of 245 is 6.2573247457

### Scales and comparisons

How big is 245?
• 245 seconds is equal to 4 minutes, 5 seconds.
• To count from 1 to 245 would take you about two 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 245 cubic inches would be around 0.5 feet tall.

### Recreational maths with 245

• 245 backwards is 542
• The number of decimal digits it has is: 3
• The sum of 245's digits is 11
• More coming soon!