12172491 has 16 divisors (see below), whose sum is σ = 18616320. Its totient is φ = 7852680.

The previous prime is 12172487. The next prime is 12172513. The reversal of 12172491 is 19427121.

12172491 is a `hidden beast` number, since 1 + 2 + 172 + 491 = 666.

12172491 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12172491 - 2² = 12172487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12172411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6435 + ... + 8108.

It is an arithmetic number, because the mean of its divisors is an integer number (1163520).

Almost surely, 2^12172491 is an apocalyptic number.

12172491 is a deficient number, since it is larger than the sum of its proper divisors (6443829).

12172491 is a wasteful number, since it uses less digits than its factorization.

12172491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14583 (or 14577 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 12172491 is about 3488.9097150829. The cubic root of 12172491 is about 230.0345946703.

The spelling of 12172491 in words is "twelve million, one hundred seventy-two thousand, four hundred ninety-one".