12172564 has 6 divisors (see below), whose sum is σ = 21301994. Its totient is φ = 6086280.

The previous prime is 12172549. The next prime is 12172579. The reversal of 12172564 is 46527121.

It is an interprime number because it is at equal distance from previous prime (12172549) and next prime (12172579).

It can be written as a sum of positive squares in only one way, i.e., 7064964 + 5107600 = 2658^2 + 2260^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1521567 + ... + 1521574.

Almost surely, 2^12172564 is an apocalyptic number.

It is an amenable number.

12172564 is a deficient number, since it is larger than the sum of its proper divisors (9129430).

12172564 is a wasteful number, since it uses less digits than its factorization.

12172564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3043145 (or 3043143 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 12172564 is about 3488.9201767882. The cubic root of 12172564 is about 230.0350545184.

Adding to 12172564 its reverse (46527121), we get a palindrome (58699685).

The spelling of 12172564 in words is "twelve million, one hundred seventy-two thousand, five hundred sixty-four".