561111723 has 6 divisors (see below), whose sum is σ = 810494724. Its totient is φ = 374074476.

The previous prime is 561111721. The next prime is 561111737. The reversal of 561111723 is 327111165.

561111723 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 561111723 - 2¹ = 561111721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561111721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31172865 + ... + 31172882.

It is an arithmetic number, because the mean of its divisors is an integer number (135082454).

Almost surely, 2^561111723 is an apocalyptic number.

561111723 is a deficient number, since it is larger than the sum of its proper divisors (249383001).

561111723 is a wasteful number, since it uses less digits than its factorization.

561111723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62345753 (or 62345750 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 561111723 is about 23687.7969216219. The cubic root of 561111723 is about 824.8021431861.

Adding to 561111723 its reverse (327111165), we get a palindrome (888222888).

The spelling of 561111723 in words is "five hundred sixty-one million, one hundred eleven thousand, seven hundred twenty-three".