11565791 has 4 divisors (see below), whose sum is σ = 11592000. Its totient is φ = 11539584.

The previous prime is 11565787. The next prime is 11565811. The reversal of 11565791 is 19756511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19756511 = 29 ⋅681259.

It is a cyclic number.

It is not a de Polignac number, because 11565791 - 2² = 11565787 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 (11565721) 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, 12431 + ... + 13328.

It is an arithmetic number, because the mean of its divisors is an integer number (2898000).

Almost surely, 2^11565791 is an apocalyptic number.

11565791 is a deficient number, since it is larger than the sum of its proper divisors (26209).

11565791 is an equidigital number, since it uses as much as digits as its factorization.

11565791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26208.

The product of its digits is 9450, while the sum is 35.

The square root of 11565791 is about 3400.8515110190. The cubic root of 11565791 is about 226.1474942387.

The spelling of 11565791 in words is "eleven million, five hundred sixty-five thousand, seven hundred ninety-one".