561076891 has 16 divisors (see below), whose sum is σ = 618719040. Its totient is φ = 506419200.

The previous prime is 561076877. The next prime is 561076903. The reversal of 561076891 is 198670165.

It is a happy number.

561076891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 561076891 - 2⁹ = 561076379 is a prime.

It is a super-2 number, since 2×561076891² = 629614555228451762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561046891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70675 + ... + 78211.

It is an arithmetic number, because the mean of its divisors is an integer number (38669940).

Almost surely, 2^561076891 is an apocalyptic number.

561076891 is a deficient number, since it is larger than the sum of its proper divisors (57642149).

561076891 is a wasteful number, since it uses less digits than its factorization.

561076891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7734.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 561076891 is about 23687.0616793219. The cubic root of 561076891 is about 824.7850758169.

The spelling of 561076891 in words is "five hundred sixty-one million, seventy-six thousand, eight hundred ninety-one".