12180391 has 2 divisors, whose sum is σ = 12180392. Its totient is φ = 12180390.

The previous prime is 12180367. The next prime is 12180401. The reversal of 12180391 is 19308121.

12180391 is nontrivially palindromic in base 15.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12180391 - 2⁵ = 12180359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12180331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6090195 + 6090196.

It is an arithmetic number, because the mean of its divisors is an integer number (6090196).

Almost surely, 2^12180391 is an apocalyptic number.

12180391 is a deficient number, since it is larger than the sum of its proper divisors (1).

12180391 is an equidigital number, since it uses as much as digits as its factorization.

12180391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 12180391 is about 3490.0416902954. The cubic root of 12180391 is about 230.0843483950.

The spelling of 12180391 in words is "twelve million, one hundred eighty thousand, three hundred ninety-one".