561111687 has 24 divisors (see below), whose sum is σ = 856114688. Its totient is φ = 353581200.

The previous prime is 561111679. The next prime is 561111721. The reversal of 561111687 is 786111165.

561111687 is a `hidden beast` number, since 561 + 1 + 1 + 16 + 87 = 666.

It is not a de Polignac number, because 561111687 - 2³ = 561111679 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 (561111637) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11389 + ... + 35382.

Almost surely, 2^561111687 is an apocalyptic number.

561111687 is a deficient number, since it is larger than the sum of its proper divisors (295003001).

561111687 is a wasteful number, since it uses less digits than its factorization.

561111687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46851 (or 46848 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 561111687 is about 23687.7961617370. The cubic root of 561111687 is about 824.8021255468.

The spelling of 561111687 in words is "five hundred sixty-one million, one hundred eleven thousand, six hundred eighty-seven".