11185561 has 4 divisors (see below), whose sum is σ = 11571300. Its totient is φ = 10799824.

The previous prime is 11185543. The next prime is 11185589. The reversal of 11185561 is 16558111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6859161 + 4326400 = 2619^2 + 2080^2 .

It is a cyclic number.

It is not a de Polignac number, because 11185561 - 2⁵ = 11185529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11185501) 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, 192826 + ... + 192883.

It is an arithmetic number, because the mean of its divisors is an integer number (2892825).

Almost surely, 2^11185561 is an apocalyptic number.

It is an amenable number.

11185561 is a deficient number, since it is larger than the sum of its proper divisors (385739).

11185561 is an equidigital number, since it uses as much as digits as its factorization.

11185561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385738.

The product of its digits is 1200, while the sum is 28.

The square root of 11185561 is about 3344.4821721755. The cubic root of 11185561 is about 223.6415997498.

The spelling of 11185561 in words is "eleven million, one hundred eighty-five thousand, five hundred sixty-one".