12968991 has 40 divisors (see below), whose sum is σ = 22476960. Its totient is φ = 7299072.

The previous prime is 12968983. The next prime is 12969007. The reversal of 12968991 is 19986921.

It is not a de Polignac number, because 12968991 - 2³ = 12968983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12968951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 50335 + ... + 50591.

It is an arithmetic number, because the mean of its divisors is an integer number (561924).

Almost surely, 2^12968991 is an apocalyptic number.

12968991 is a deficient number, since it is larger than the sum of its proper divisors (9507969).

12968991 is an equidigital number, since it uses as much as digits as its factorization.

12968991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 356 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 12968991 is about 3601.2485334950. The cubic root of 12968991 is about 234.9463647023.

The spelling of 12968991 in words is "twelve million, nine hundred sixty-eight thousand, nine hundred ninety-one".