It is a Curzon number.
It is a congruent number.
It is an unprimeable number.
21172166 is an apocalyptic number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1172166 is a wasteful number, since it uses less digits than its factorization.
1172166 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 915.
The square root of 1172166 is about 1082.6661535303. Note that the first 3 decimals coincide. The cubic root of 1172166 is about 105.4378091571.
Adding to 1172166 its reverse (6612711), we get a palindrome (7784877).
The spelling of 1172166 in words is "one million, one hundred seventy-two thousand, one hundred sixty-six".