#include <bits/stdc++.h>
using namespace std;
int main() {
  long long n;
  cin >> n;
  if (n == 1) {
    cout << 1;
    return 0;
  }
  for (long long i = 2; i * i <= n; i++) {
    if (n % i == 0) {
      while (n % i == 0) {
        n /= i;
      }
      if (n == 1) {
        cout << i;
      } else {
        cout << 1;
      }
      getchar();
      getchar();
      return 0;
    }
  }
  cout << n;
  getchar();
  getchar();
}
