Factors of 243
The factors of 243 are 1, 3, 9, 27, 81, and 243. In total, 243 has 6 factors. Its prime factorization is 3⁵, and the sum of all its factors is 364.
All factors of 243
Here are all 6 factors of 243, listed from smallest to largest.
Factor pairs of 243
These 3 pairs of whole numbers each multiply to give 243.
Prime factorization of 243
Dividing 243 by the smallest prime at each step gives its prime factorization:
The distinct prime factors of 243 are 3. To factorize any other number, use the prime factorization calculator.
Factor tree of 243
A factor tree shows the same prime factorization visually. Each composite branch splits until every endpoint is a prime number.
Properties of 243
| Number of factors | 6 |
|---|---|
| Sum of factors | 364 |
| Sum of proper factors | 121 |
| Prime factorization | 3⁵ |
| Prime or composite? | Composite |
| Even or odd? | Odd |
| Perfect square? | No |
| Perfect cube? | No |
| Classification | Deficient |
What makes 243 interesting
- 243 is a composite number, meaning it has more than two factors. It can be written as a product of smaller whole numbers in 3 different ways.
- 243 is a deficient number: its proper factors sum to 121, which is 122 less than 243 itself.
- 243 is a prime power: it is 3 raised to the power of 5. All of its factors are powers of 3.
How to find the factors of 243 yourself
Divide 243 by each whole number starting from 1. Whenever the division leaves no remainder, both the divisor and the quotient are factors. You only need to test up to √243 ≈ 15.59, because every factor above that pairs with one below it.
Reading both columns gives every factor: 1, 3, 9, 27, 81, 243. The factor calculator does this automatically for any number.
Related numbers
Numbers mathematically connected to 243.
Frequently asked questions about 243
What are the factors of 243?
Is 243 a prime number?
What is the prime factorization of 243?
What two numbers multiply to give 243?
What is the sum of the factors of 243?
Is 243 a perfect square?
What is the largest factor of 243 other than itself?
How many factors does 243 have?
Explore more
Try another number in the factor calculator, break 243 down further with the prime factorization calculator, or compare 243 with another number using the GCF calculator and LCM calculator. For divisor counts and sums, see the divisor calculator.