# Prime Factorization of 81

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

### Negative Factors of 81

1. Lack of sunlight

2. Limited fresh food

3. Elevated levels of air pollution

4. High levels of noise pollution

5. Lack of recreational spaces

6. Traffic congestion

7. Limited green space

8. Poor public transportation

9. Limited employment opportunities

10. High cost of living

### 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.

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