561881436 has 24 divisors (see below), whose sum is σ = 1312276224. Its totient is φ = 187119600.

The previous prime is 561881429. The next prime is 561881449. The reversal of 561881436 is 634188165.

561881436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7990 + ... + 34461.

It is an arithmetic number, because the mean of its divisors is an integer number (54678176).

Almost surely, 2^561881436 is an apocalyptic number.

It is an amenable number.

561881436 is an abundant number, since it is smaller than the sum of its proper divisors (750394788).

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

561881436 is a wasteful number, since it uses less digits than its factorization.

561881436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43561 (or 43559 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 561881436 is about 23704.0383901140. The cubic root of 561881436 is about 825.1791155631.

The spelling of 561881436 in words is "five hundred sixty-one million, eight hundred eighty-one thousand, four hundred thirty-six".