Power of Three

Given an integer, write a function to determine if it is a power of three.

Example 1:

Input: 27
Output: true

Example 2:

Input: 0
Output: false

Example 3:

Input: 9
Output: true

Example 4:

Input: 45
Output: false

Follow up:
Could you do it without using any loop / recursion?

My solution:

class Solution:
    def isPowerOfThree(self, n):
        """
        :type n: int
        :rtype: bool
        """
        if n == 0:
            return False

        while n % 3 == 0:
            n = n // 3

        if n * 3 == 3:
            return True
        return False