561106111 has 4 divisors (see below), whose sum is σ = 568208800. Its totient is φ = 554003424.

The previous prime is 561106093. The next prime is 561106127. The reversal of 561106111 is 111601165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561106111 - 2¹⁹ = 560581823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561106141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3551226 + ... + 3551383.

It is an arithmetic number, because the mean of its divisors is an integer number (142052200).

Almost surely, 2^561106111 is an apocalyptic number.

561106111 is a deficient number, since it is larger than the sum of its proper divisors (7102689).

561106111 is an equidigital number, since it uses as much as digits as its factorization.

561106111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7102688.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 561106111 is about 23687.6784637077. The cubic root of 561106111 is about 824.7993934039.

Adding to 561106111 its reverse (111601165), we get a palindrome (672707276).

The spelling of 561106111 in words is "five hundred sixty-one million, one hundred six thousand, one hundred eleven".