Leetcode 326 Power of Three

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

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

1162261467 = 3^19为int范围内最大, 如果一个数为3的n方，则该数需要能被这个最大的数整除。

class Solution(object):
def isPowerOfThree(self, n):
return n>0 and 1162261467%n==0