# Prime decomposition of 81

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The number 81 is a composite number because 81 can be divided by one, by itself and at least by 3. A composite number is an integer that can be divided by at least another natural number, besides itself and 1, without leaving a remainder (divided exactly).

The factorization or decomposition of 81 = 34. Notice that here, it is written in exponential form.

The prime factors of 81 are 3. It is the list of the integer's prime factors.

The number of prime factors of 81 is 1.

### Factor tree or prime decomposition for 81

As 81 is a composite number, we can draw its factor tree:

Here you can find the answer to questions related to: Prime decomposition of 81 or list the factors of 81. By using our online calculator to find the prime factors of any composite number and check if a number is prime or composite. This tool also draws the prime factor tree if the number is factorable and smaller than 16000.

## What is prime number? How to factorize a number?

Watch this video below to learn more on prime numbers, prime factors and how you can draw a factor tree.

You can also find this video about factorization at mathantics.com

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