561655542 has 48 divisors (see below), whose sum is σ = 1375496640. Its totient is φ = 152025552.

The previous prime is 561655517. The next prime is 561655543. The reversal of 561655542 is 245556165.

It is a happy number.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 561655542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561655543) 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 23 ways as a sum of consecutive naturals, for example, 44688 + ... + 55859.

It is an arithmetic number, because the mean of its divisors is an integer number (28656180).

Almost surely, 2^561655542 is an apocalyptic number.

561655542 is an abundant number, since it is smaller than the sum of its proper divisors (813841098).

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

561655542 is a wasteful number, since it uses less digits than its factorization.

561655542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100585 (or 100578 counting only the distinct ones).

The product of its digits is 180000, while the sum is 39.

The square root of 561655542 is about 23699.2730268251. The cubic root of 561655542 is about 825.0685180925.

The spelling of 561655542 in words is "five hundred sixty-one million, six hundred fifty-five thousand, five hundred forty-two".