561391256 has 16 divisors (see below), whose sum is σ = 1058491800. Its totient is φ = 279126784.

The previous prime is 561391253. The next prime is 561391261. The reversal of 561391256 is 652193165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561391253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194585 + ... + 197448.

Almost surely, 2^561391256 is an apocalyptic number.

It is an amenable number.

561391256 is a deficient number, since it is larger than the sum of its proper divisors (497100544).

561391256 is a wasteful number, since it uses less digits than its factorization.

561391256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392218 (or 392214 counting only the distinct ones).

The product of its digits is 48600, while the sum is 38.

The square root of 561391256 is about 23693.6965457060. The cubic root of 561391256 is about 824.9390862892.

It can be divided in two parts, 5613 and 91256, that added together give a palindrome (96869).

The spelling of 561391256 in words is "five hundred sixty-one million, three hundred ninety-one thousand, two hundred fifty-six".