Prime Factorization of 81

Factors of 81 – Prime Factorization and Factor Tree: The prime factorization of 81 is 3 x 3 x 3 x 3.

What are the Factors of 81?

The factors of 81 are 1, 3, 9, 27, 81.

Factors of 81 in Pairs

There are six factors of 81 in pairs: 1, 3, 9, 27, 81, 243.

Prime Factor Tree of 81

1

3

9

27

81

Calculate Factors of 81 by Prime Factorization Method

The prime factorization of 81 is 3 x 3 x 3 x 9.

Prime factorization of 81

81 = 3 × 3 × 3 × 11

Factors of 81 in Pairs

1, 3, 9, 27, 81

Number of factors of 81

There are six factors of 81: 1, 3, 9, 27, 81, 243.

The highest common factor of 81

and 144

The highest common factor of 81 and 144 is 12.

Highlights of Factors of 81

• The number 81 is a composite number, which means that it is made up of smaller numbers. In this case, the smaller numbers are 3 and 27.
• 81 is also a square number, because it is the result of multiplying a number (3) by itself (3).
• The number 81 is also a triangular number, because it is the result of adding up the numbers 1 through 9.
• The number 81 is also a Fibonacci number, because it is the result of adding the two previous Fibonacci numbers together.