#include <bits/stdc++.h>
using namespace std;
int main() {
  std::ios_base::sync_with_stdio(false);
  vector<long long int> v;
  long long int n, i;
  cin >> n;
  if (n == 1) {
    cout << 1;
    return 0;
  }
  for (long long int i = 1; i * i <= n; ++i) {
    if (n % i == 0) {
      if (i * i == n)
        v.push_back(i);
      else {
        v.push_back(i);
        v.push_back(n / i);
      }
    }
  }
  sort(v.begin(), v.end());
  if (v.size() == 2)
    cout << n;
  else {
    long long int flag = 0;
    if (v.size() == 3) {
      if (v[1] / v[0] != v[2] / v[1]) {
        cout << 1;
      } else
        cout << v[1];
    } else {
      long long int ans = v[1] / v[0];
      for (i = 1; i < v.size() - 1; i++) {
        if (v[i + 1] != ans * v[i]) {
          flag = 1;
          break;
        }
      }
      if (flag == 1)
        cout << 1;
      else {
        cout << v[1];
      }
    }
  }
  return 0;
}
