Steps to find Prime Factors of 81 by Division Method

To find the primefactors of 81 using the division method, follow these steps:

  • Step 1. Start dividing 81 by the smallest prime number, i.e., 2, 3, 5, and so on. Find the smallest prime factor of the number.
  • Step 2. After finding the smallest prime factor of the number 81, which is 3. Divide 81 by 3 to obtain the quotient (27).
    81 ÷ 3 = 27
  • Step 3. Repeat step 1 with the obtained quotient (27).
    27 ÷ 3 = 9
    9 ÷ 3 = 3
    3 ÷ 3 = 1

So, the prime factorization of 81 is, 81 = 3 x 3 x 3 x 3.

Steps to find Prime Factors of 81 by Factor Tree Method

We can follow the same procedure using the factor tree of 81 as shown below:

So, the prime factorization of 81 is, 81 = 3 x 3 x 3 x 3.

Introduction to Prime Factors?

In mathematics, prime numbers are defined as all those natural numbers greater than 1 that has only two divisors one being number 1 and the other being the number itself. When we express any number as the products of these prime numbers than these prime numbers become prime factors of that number. Eg- Prime Factors of 81 are 3 x 3 x 3 x 3.

Properties of Prime Factors

  • Prime factors are the set of factors that are unique to the number given.
  • 2 is the only even prime factor any number can have.
  • Two prime factors are always coprime to each other.
  • 1 is neither a prime number nor a composite number and also 1 is the factor of every given number. So, 1 is the factor of 81 but not a prime factor of 81.

Frequently Asked Questions

  • Which is the smallest prime factor of 81?

    Smallest prime factor of 81 is 3.

  • What is the prime factorization of 81?

    Prime factorization of 81 is 3 x 3 x 3 x 3.

  • What is prime factorization of 81 in exponential form?

    Prime factorization of 81 in exponential form is 34.

  • Is 81 a prime number or a composite number?

    81 is a composite number.

  • Is 81 a prime number?

    false, 81 is not a prime number.

  • How to find prime factorization of 81 easily?

    To find prime factorization of 81 easily you can refer to the steps given on this page step by step.

  • Which is the largest prime factors of 81?

    The largest prime factor of 81 is 3.

  • What is the product of all prime factors of 81?

    Prime factors of 81 are 3 x 3 x 3 x 3. Therefore, their product is 81.

  • What is the sum of all odd prime factors of 81?

    Prime factors of 81 are 3 , 3 , 3 , 3, out of which 3 , 3 , 3 , 3 are odd numbers. So, the sum of odd prime factors of 81 is 3 + 3 + 3 + 3 = 12.