12331391 has 2 divisors, whose sum is σ = 12331392. Its totient is φ = 12331390.

The previous prime is 12331387. The next prime is 12331441. The reversal of 12331391 is 19313321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12331391 - 2² = 12331387 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12331301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6165695 + 6165696.

It is an arithmetic number, because the mean of its divisors is an integer number (6165696).

Almost surely, 2^12331391 is an apocalyptic number.

12331391 is a deficient number, since it is larger than the sum of its proper divisors (1).

12331391 is an equidigital number, since it uses as much as digits as its factorization.

12331391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486, while the sum is 23.

The square root of 12331391 is about 3511.6080362136. The cubic root of 12331391 is about 231.0312295753.

The spelling of 12331391 in words is "twelve million, three hundred thirty-one thousand, three hundred ninety-one".