12180591 has 16 divisors (see below), whose sum is σ = 18144000. Its totient is φ = 8076024.

The previous prime is 12180569. The next prime is 12180599. The reversal of 12180591 is 19508121.

It is not a de Polignac number, because 12180591 - 2⁶ = 12180527 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12180599) 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, 4240 + ... + 6506.

It is an arithmetic number, because the mean of its divisors is an integer number (1134000).

Almost surely, 2^12180591 is an apocalyptic number.

12180591 is a deficient number, since it is larger than the sum of its proper divisors (5963409).

12180591 is a wasteful number, since it uses less digits than its factorization.

12180591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2475 (or 2469 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 12180591 is about 3490.0703431306. The cubic root of 12180591 is about 230.0856077037.

The spelling of 12180591 in words is "twelve million, one hundred eighty thousand, five hundred ninety-one".