12311191 has 2 divisors, whose sum is σ = 12311192. Its totient is φ = 12311190.

The previous prime is 12311153. The next prime is 12311207. The reversal of 12311191 is 19111321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12311191 - 2⁷ = 12311063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12311591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6155595 + 6155596.

It is an arithmetic number, because the mean of its divisors is an integer number (6155596).

Almost surely, 2^12311191 is an apocalyptic number.

12311191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12311191 is an equidigital number, since it uses as much as digits as its factorization.

12311191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54, while the sum is 19.

The square root of 12311191 is about 3508.7306821698. The cubic root of 12311191 is about 230.9050102002.

The spelling of 12311191 in words is "twelve million, three hundred eleven thousand, one hundred ninety-one".