561617118 has 32 divisors (see below), whose sum is σ = 1268505120. Its totient is φ = 184135680.

The previous prime is 561617107. The next prime is 561617131. The reversal of 561617118 is 811716165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81955 + ... + 88542.

It is an arithmetic number, because the mean of its divisors is an integer number (39640785).

Almost surely, 2^561617118 is an apocalyptic number.

561617118 is an abundant number, since it is smaller than the sum of its proper divisors (706888002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561617118 is a wasteful number, since it uses less digits than its factorization.

561617118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170569 (or 170563 counting only the distinct ones).

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

The square root of 561617118 is about 23698.4623551825. The cubic root of 561617118 is about 825.0497027907.

The spelling of 561617118 in words is "five hundred sixty-one million, six hundred seventeen thousand, one hundred eighteen".