12911191 has 2 divisors, whose sum is σ = 12911192. Its totient is φ = 12911190.

The previous prime is 12911161. The next prime is 12911219. The reversal of 12911191 is 19111921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12911191 - 2⁹ = 12910679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12911161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6455595 + 6455596.

It is an arithmetic number, because the mean of its divisors is an integer number (6455596).

Almost surely, 2^12911191 is an apocalyptic number.

12911191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12911191 is an equidigital number, since it uses as much as digits as its factorization.

12911191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 25.

The square root of 12911191 is about 3593.2145775058. The cubic root of 12911191 is about 234.5968097726.

It can be divided in two parts, 1 and 2911191, that added together give a palindrome (2911192).

The spelling of 12911191 in words is "twelve million, nine hundred eleven thousand, one hundred ninety-one".