561833989 has 2 divisors, whose sum is σ = 561833990. Its totient is φ = 561833988.

The previous prime is 561833981. The next prime is 561834043. The reversal of 561833989 is 989338165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 407030625 + 154803364 = 20175^2 + 12442^2 .

It is a cyclic number.

It is not a de Polignac number, because 561833989 - 2³ = 561833981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561833981) 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, 280916994 + 280916995.

It is an arithmetic number, because the mean of its divisors is an integer number (280916995).

Almost surely, 2^561833989 is an apocalyptic number.

It is an amenable number.

561833989 is a deficient number, since it is larger than the sum of its proper divisors (1).

561833989 is an equidigital number, since it uses as much as digits as its factorization.

561833989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 52.

The square root of 561833989 is about 23703.0375479600. The cubic root of 561833989 is about 825.1558880201.

The spelling of 561833989 in words is "five hundred sixty-one million, eight hundred thirty-three thousand, nine hundred eighty-nine".