561031816 has 32 divisors (see below), whose sum is σ = 1064456640. Its totient is φ = 277190848.

The previous prime is 561031813. The next prime is 561031817. The reversal of 561031816 is 618130165.

It is not an unprimeable number, because it can be changed into a prime (561031811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 553326 + ... + 554338.

It is an arithmetic number, because the mean of its divisors is an integer number (33264270).

Almost surely, 2^561031816 is an apocalyptic number.

It is an amenable number.

561031816 is a deficient number, since it is larger than the sum of its proper divisors (503424824).

561031816 is a wasteful number, since it uses less digits than its factorization.

561031816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1773 (or 1769 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 561031816 is about 23686.1101914181. The cubic root of 561031816 is about 824.7629884207.

The spelling of 561031816 in words is "five hundred sixty-one million, thirty-one thousand, eight hundred sixteen".