561605500 has 24 divisors (see below), whose sum is σ = 1226547504. Its totient is φ = 224642000.

The previous prime is 561605497. The next prime is 561605507. The reversal of 561605500 is 5506165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561605507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 561106 + ... + 562105.

It is an arithmetic number, because the mean of its divisors is an integer number (51106146).

Almost surely, 2^561605500 is an apocalyptic number.

561605500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

561605500 is an abundant number, since it is smaller than the sum of its proper divisors (664942004).

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

561605500 is a wasteful number, since it uses less digits than its factorization.

561605500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123230 (or 1123218 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 561605500 is about 23698.2172325262. The cubic root of 561605500 is about 825.0440135686.

The spelling of 561605500 in words is "five hundred sixty-one million, six hundred five thousand, five hundred".