12591919 has 2 divisors, whose sum is σ = 12591920. Its totient is φ = 12591918.

The previous prime is 12591907. The next prime is 12591937. The reversal of 12591919 is 91919521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12591919 - 2⁷ = 12591791 is a prime.

It is a super-2 number, since 2×12591919² = 317112848205122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12591949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6295959 + 6295960.

It is an arithmetic number, because the mean of its divisors is an integer number (6295960).

Almost surely, 2^12591919 is an apocalyptic number.

12591919 is a deficient number, since it is larger than the sum of its proper divisors (1).

12591919 is an equidigital number, since it uses as much as digits as its factorization.

12591919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7290, while the sum is 37.

The square root of 12591919 is about 3548.5094053701. The cubic root of 12591919 is about 232.6469198965.

The spelling of 12591919 in words is "twelve million, five hundred ninety-one thousand, nine hundred nineteen".