561555604 has 12 divisors (see below), whose sum is σ = 990224928. Its totient is φ = 278634200.

The previous prime is 561555593. The next prime is 561555613. The reversal of 561555604 is 406555165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535312 + ... + 536359.

It is an arithmetic number, because the mean of its divisors is an integer number (82518744).

Almost surely, 2^561555604 is an apocalyptic number.

It is an amenable number.

561555604 is a deficient number, since it is larger than the sum of its proper divisors (428669324).

561555604 is a wasteful number, since it uses less digits than its factorization.

561555604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071806 (or 1071804 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 37.

The square root of 561555604 is about 23697.1644717253. The cubic root of 561555604 is about 825.0195790884.

The spelling of 561555604 in words is "five hundred sixty-one million, five hundred fifty-five thousand, six hundred four".