561243556 has 18 divisors (see below), whose sum is σ = 988425942. Its totient is φ = 278847360.

The previous prime is 561243517. The next prime is 561243563. The reversal of 561243556 is 655342165.

561243556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 382593600 + 178649956 = 19560^2 + 13366^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103636 + ... + 108916.

Almost surely, 2^561243556 is an apocalyptic number.

It is an amenable number.

561243556 is a deficient number, since it is larger than the sum of its proper divisors (427182386).

561243556 is a wasteful number, since it uses less digits than its factorization.

561243556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5611 (or 5446 counting only the distinct ones).

The product of its digits is 108000, while the sum is 37.

The square root of 561243556 is about 23690.5794779275. The cubic root of 561243556 is about 824.8667337847.

The spelling of 561243556 in words is "five hundred sixty-one million, two hundred forty-three thousand, five hundred fifty-six".