561116789 has 2 divisors, whose sum is σ = 561116790. Its totient is φ = 561116788.

The previous prime is 561116783. The next prime is 561116867. The reversal of 561116789 is 987611165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 550606225 + 10510564 = 23465^2 + 3242^2 .

It is a cyclic number.

It is not a de Polignac number, because 561116789 - 2²⁴ = 544339573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561116783) 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, 280558394 + 280558395.

It is an arithmetic number, because the mean of its divisors is an integer number (280558395).

Almost surely, 2^561116789 is an apocalyptic number.

It is an amenable number.

561116789 is a deficient number, since it is larger than the sum of its proper divisors (1).

561116789 is an equidigital number, since it uses as much as digits as its factorization.

561116789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 44.

The square root of 561116789 is about 23687.9038540771. The cubic root of 561116789 is about 824.8046254221.

The spelling of 561116789 in words is "five hundred sixty-one million, one hundred sixteen thousand, seven hundred eighty-nine".