12331591 has 2 divisors, whose sum is σ = 12331592. Its totient is φ = 12331590.

The previous prime is 12331541. The next prime is 12331597. The reversal of 12331591 is 19513321.

12331591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12331591 - 2⁷ = 12331463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12331597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6165795 + 6165796.

It is an arithmetic number, because the mean of its divisors is an integer number (6165796).

Almost surely, 2^12331591 is an apocalyptic number.

12331591 is a deficient number, since it is larger than the sum of its proper divisors (1).

12331591 is an equidigital number, since it uses as much as digits as its factorization.

12331591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810, while the sum is 25.

The square root of 12331591 is about 3511.6365130805. The cubic root of 12331591 is about 231.0324785827.

The spelling of 12331591 in words is "twelve million, three hundred thirty-one thousand, five hundred ninety-one".