561111079 has 2 divisors, whose sum is σ = 561111080. Its totient is φ = 561111078.

The previous prime is 561111043. The next prime is 561111107. The reversal of 561111079 is 970111165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561111079 - 2⁷ = 561110951 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561111079.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561111379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280555539 + 280555540.

It is an arithmetic number, because the mean of its divisors is an integer number (280555540).

Almost surely, 2^561111079 is an apocalyptic number.

561111079 is a deficient number, since it is larger than the sum of its proper divisors (1).

561111079 is an equidigital number, since it uses as much as digits as its factorization.

561111079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 31.

The square root of 561111079 is about 23687.7833281208. The cubic root of 561111079 is about 824.8018276383.

The spelling of 561111079 in words is "five hundred sixty-one million, one hundred eleven thousand, seventy-nine".