11565641 has 4 divisors (see below), whose sum is σ = 11584272. Its totient is φ = 11547012.

The previous prime is 11565637. The next prime is 11565647. The reversal of 11565641 is 14656511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11565641 - 2² = 11565637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11565647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8351 + ... + 9636.

It is an arithmetic number, because the mean of its divisors is an integer number (2896068).

Almost surely, 2^11565641 is an apocalyptic number.

It is an amenable number.

11565641 is a deficient number, since it is larger than the sum of its proper divisors (18631).

11565641 is an equidigital number, since it uses as much as digits as its factorization.

11565641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18630.

The product of its digits is 3600, while the sum is 29.

The square root of 11565641 is about 3400.8294576471. The cubic root of 11565641 is about 226.1465165776.

It can be divided in two parts, 115 and 65641, that added together give a palindrome (65756).

The spelling of 11565641 in words is "eleven million, five hundred sixty-five thousand, six hundred forty-one".