561886679 has 2 divisors, whose sum is σ = 561886680. Its totient is φ = 561886678.

The previous prime is 561886651. The next prime is 561886747. The reversal of 561886679 is 976688165.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561886679 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561886279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280943339 + 280943340.

It is an arithmetic number, because the mean of its divisors is an integer number (280943340).

Almost surely, 2^561886679 is an apocalyptic number.

561886679 is a deficient number, since it is larger than the sum of its proper divisors (1).

561886679 is an equidigital number, since it uses as much as digits as its factorization.

561886679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4354560, while the sum is 56.

The square root of 561886679 is about 23704.1489828258. The cubic root of 561886679 is about 825.1816821785.

The spelling of 561886679 in words is "five hundred sixty-one million, eight hundred eighty-six thousand, six hundred seventy-nine".