561321073 has 2 divisors, whose sum is σ = 561321074. Its totient is φ = 561321072.

The previous prime is 561321067. The next prime is 561321083. The reversal of 561321073 is 370123165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 284664384 + 276656689 = 16872^2 + 16633^2 .

It is a cyclic number.

It is not a de Polignac number, because 561321073 - 2²¹ = 559223921 is a prime.

It is not a weakly prime, because it can be changed into another prime (561321023) 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, 280660536 + 280660537.

It is an arithmetic number, because the mean of its divisors is an integer number (280660537).

Almost surely, 2^561321073 is an apocalyptic number.

It is an amenable number.

561321073 is a deficient number, since it is larger than the sum of its proper divisors (1).

561321073 is an equidigital number, since it uses as much as digits as its factorization.

561321073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 561321073 is about 23692.2154514938. The cubic root of 561321073 is about 824.9047079407.

The spelling of 561321073 in words is "five hundred sixty-one million, three hundred twenty-one thousand, seventy-three".