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:
1 5 7 35 49 245
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
Hexadecimal: 0xF5
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!

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The information we have on file for 245 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

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