12585891 has 4 divisors (see below), whose sum is σ = 16781192. Its totient is φ = 8390592.

The previous prime is 12585889. The next prime is 12585931. The reversal of 12585891 is 19858521.

12585891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19858521 = 3 ⋅6619507.

It is not a de Polignac number, because 12585891 - 2¹ = 12585889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12585091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2097646 + ... + 2097651.

It is an arithmetic number, because the mean of its divisors is an integer number (4195298).

Almost surely, 2^12585891 is an apocalyptic number.

12585891 is a deficient number, since it is larger than the sum of its proper divisors (4195301).

12585891 is an equidigital number, since it uses as much as digits as its factorization.

12585891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4195300.

The product of its digits is 28800, while the sum is 39.

The square root of 12585891 is about 3547.6599329699. The cubic root of 12585891 is about 232.6097897478.

It can be divided in two parts, 12 and 585891, that added together give a triangular number (585903 = T₁₀₈₂).

The spelling of 12585891 in words is "twelve million, five hundred eighty-five thousand, eight hundred ninety-one".