561330863 has 2 divisors, whose sum is σ = 561330864. Its totient is φ = 561330862.

The previous prime is 561330859. The next prime is 561330883. The reversal of 561330863 is 368033165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561330863 - 2² = 561330859 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561330883) 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 as a sum of consecutive naturals, namely, 280665431 + 280665432.

It is an arithmetic number, because the mean of its divisors is an integer number (280665432).

Almost surely, 2^561330863 is an apocalyptic number.

561330863 is a deficient number, since it is larger than the sum of its proper divisors (1).

561330863 is an equidigital number, since it uses as much as digits as its factorization.

561330863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 561330863 is about 23692.4220585402. The cubic root of 561330863 is about 824.9095036334.

The spelling of 561330863 in words is "five hundred sixty-one million, three hundred thirty thousand, eight hundred sixty-three".