12908591 has 4 divisors (see below), whose sum is σ = 12941184. Its totient is φ = 12876000.

The previous prime is 12908579. The next prime is 12908603. The reversal of 12908591 is 19580921.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (12908579) and next prime (12908603).

It is a cyclic number.

It is not a de Polignac number, because 12908591 - 2²² = 8714287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12908531) 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 3 ways as a sum of consecutive naturals, for example, 15695 + ... + 16496.

It is an arithmetic number, because the mean of its divisors is an integer number (3235296).

Almost surely, 2^12908591 is an apocalyptic number.

12908591 is a deficient number, since it is larger than the sum of its proper divisors (32593).

12908591 is an equidigital number, since it uses as much as digits as its factorization.

12908591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32592.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 12908591 is about 3592.8527662569. The cubic root of 12908591 is about 234.5810613506.

The spelling of 12908591 in words is "twelve million, nine hundred eight thousand, five hundred ninety-one".