561838657 has 2 divisors, whose sum is σ = 561838658. Its totient is φ = 561838656.

The previous prime is 561838643. The next prime is 561838789. The reversal of 561838657 is 756838165.

561838657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 481539136 + 80299521 = 21944^2 + 8961^2 .

It is a cyclic number.

It is not a de Polignac number, because 561838657 - 2¹¹ = 561836609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561838657.

It is not a weakly prime, because it can be changed into another prime (561838157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280919328 + 280919329.

It is an arithmetic number, because the mean of its divisors is an integer number (280919329).

Almost surely, 2^561838657 is an apocalyptic number.

It is an amenable number.

561838657 is a deficient number, since it is larger than the sum of its proper divisors (1).

561838657 is an equidigital number, since it uses as much as digits as its factorization.

561838657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1209600, while the sum is 49.

The square root of 561838657 is about 23703.1360161477. The cubic root of 561838657 is about 825.1581732841.

The spelling of 561838657 in words is "five hundred sixty-one million, eight hundred thirty-eight thousand, six hundred fifty-seven".