11564591 has 6 divisors (see below), whose sum is σ = 11977992. Its totient is φ = 11165000.

The previous prime is 11564543. The next prime is 11564599. The reversal of 11564591 is 19546511.

It is not a de Polignac number, because 11564591 - 2¹⁰ = 11563567 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 (11564599) 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 5 ways as a sum of consecutive naturals, for example, 6035 + ... + 7716.

It is an arithmetic number, because the mean of its divisors is an integer number (1996332).

Almost surely, 2^11564591 is an apocalyptic number.

11564591 is a deficient number, since it is larger than the sum of its proper divisors (413401).

11564591 is an equidigital number, since it uses as much as digits as its factorization.

11564591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13809 (or 13780 counting only the distinct ones).

The product of its digits is 5400, while the sum is 32.

The square root of 11564591 is about 3400.6750800393. The cubic root of 11564591 is about 226.1396727134.

The spelling of 11564591 in words is "eleven million, five hundred sixty-four thousand, five hundred ninety-one".