11555563 has 16 divisors (see below), whose sum is σ = 12791520. Its totient is φ = 10393600.

The previous prime is 11555549. The next prime is 11555587. The reversal of 11555563 is 36555511.

11555563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11555563 - 2⁹ = 11555051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11555263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40983 + ... + 41263.

It is an arithmetic number, because the mean of its divisors is an integer number (799470).

Almost surely, 2^11555563 is an apocalyptic number.

11555563 is a deficient number, since it is larger than the sum of its proper divisors (1235957).

11555563 is a wasteful number, since it uses less digits than its factorization.

11555563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398.

The product of its digits is 11250, while the sum is 31.

The square root of 11555563 is about 3399.3474373768. The cubic root of 11555563 is about 226.0808114170.

The spelling of 11555563 in words is "eleven million, five hundred fifty-five thousand, five hundred sixty-three".