561542388 has 24 divisors (see below), whose sum is σ = 1429380960. Its totient is φ = 170164320.

The previous prime is 561542381. The next prime is 561542407. The reversal of 561542388 is 883245165.

561542388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561542381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2126923 + ... + 2127186.

It is an arithmetic number, because the mean of its divisors is an integer number (59557540).

Almost surely, 2^561542388 is an apocalyptic number.

It is an amenable number.

561542388 is an abundant number, since it is smaller than the sum of its proper divisors (867838572).

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

561542388 is a wasteful number, since it uses less digits than its factorization.

561542388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4254127 (or 4254125 counting only the distinct ones).

The product of its digits is 230400, while the sum is 42.

The square root of 561542388 is about 23696.8856181567. The cubic root of 561542388 is about 825.0131068625.

The spelling of 561542388 in words is "five hundred sixty-one million, five hundred forty-two thousand, three hundred eighty-eight".