11817172 has 6 divisors (see below), whose sum is σ = 20680058. Its totient is φ = 5908584.

The previous prime is 11817161. The next prime is 11817191. The reversal of 11817172 is 27171811.

It can be written as a sum of positive squares in only one way, i.e., 10214416 + 1602756 = 3196^2 + 1266^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 11817172.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1477143 + ... + 1477150.

Almost surely, 2^11817172 is an apocalyptic number.

It is an amenable number.

11817172 is a deficient number, since it is larger than the sum of its proper divisors (8862886).

11817172 is a wasteful number, since it uses less digits than its factorization.

11817172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2954297 (or 2954295 counting only the distinct ones).

The product of its digits is 784, while the sum is 28.

The square root of 11817172 is about 3437.6113800137. The cubic root of 11817172 is about 227.7741942107.

Adding to 11817172 its reverse (27171811), we get a palindrome (38988983).

The spelling of 11817172 in words is "eleven million, eight hundred seventeen thousand, one hundred seventy-two".