11688561 has 12 divisors (see below), whose sum is σ = 17276688. Its totient is φ = 7610904.

The previous prime is 11688539. The next prime is 11688563. The reversal of 11688561 is 16588611.

11688561 is a `hidden beast` number, since 1 + 16 + 88 + 561 = 666.

11688561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11688561 - 2⁵ = 11688529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11688563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14715 + ... + 15488.

It is an arithmetic number, because the mean of its divisors is an integer number (1439724).

Almost surely, 2^11688561 is an apocalyptic number.

It is an amenable number.

11688561 is a deficient number, since it is larger than the sum of its proper divisors (5588127).

11688561 is a wasteful number, since it uses less digits than its factorization.

11688561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30252 (or 30249 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 11688561 is about 3418.8537552811. The cubic root of 11688561 is about 226.9448590734.

The spelling of 11688561 in words is "eleven million, six hundred eighty-eight thousand, five hundred sixty-one".