561081685 has 32 divisors (see below), whose sum is σ = 757935360. Its totient is φ = 396223488.

The previous prime is 561081683. The next prime is 561081749. The reversal of 561081685 is 586180165.

561081685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 561081685 - 2¹ = 561081683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561081683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164659 + ... + 168031.

It is an arithmetic number, because the mean of its divisors is an integer number (23685480).

Almost surely, 2^561081685 is an apocalyptic number.

It is an amenable number.

561081685 is a deficient number, since it is larger than the sum of its proper divisors (196853675).

561081685 is a wasteful number, since it uses less digits than its factorization.

561081685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 561081685 is about 23687.1628735904. The cubic root of 561081685 is about 824.7874248761.

The spelling of 561081685 in words is "five hundred sixty-one million, eighty-one thousand, six hundred eighty-five".