561542164 has 12 divisors (see below), whose sum is σ = 1040504724. Its totient is φ = 264255104.

The previous prime is 561542161. The next prime is 561542197. The reversal of 561542164 is 461245165.

It can be written as a sum of positive squares in 2 ways, for example, as 522579600 + 38962564 = 22860^2 + 6242^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561542161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4128919 + ... + 4129054.

It is an arithmetic number, because the mean of its divisors is an integer number (86708727).

Almost surely, 2^561542164 is an apocalyptic number.

It is an amenable number.

561542164 is a deficient number, since it is larger than the sum of its proper divisors (478962560).

561542164 is a wasteful number, since it uses less digits than its factorization.

561542164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8257994 (or 8257992 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The square root of 561542164 is about 23696.8808917967. The cubic root of 561542164 is about 825.0129971629.

The spelling of 561542164 in words is "five hundred sixty-one million, five hundred forty-two thousand, one hundred sixty-four".