561321473 has 2 divisors, whose sum is σ = 561321474. Its totient is φ = 561321472.

The previous prime is 561321461. The next prime is 561321499. The reversal of 561321473 is 374123165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 561310864 + 10609 = 23692^2 + 103^2 .

It is a cyclic number.

It is not a de Polignac number, because 561321473 - 2⁸ = 561321217 is a prime.

It is not a weakly prime, because it can be changed into another prime (561321073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280660736 + 280660737.

It is an arithmetic number, because the mean of its divisors is an integer number (280660737).

Almost surely, 2^561321473 is an apocalyptic number.

It is an amenable number.

561321473 is a deficient number, since it is larger than the sum of its proper divisors (1).

561321473 is an equidigital number, since it uses as much as digits as its factorization.

561321473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 32.

The square root of 561321473 is about 23692.2238930836. The cubic root of 561321473 is about 824.9049038843.

The spelling of 561321473 in words is "five hundred sixty-one million, three hundred twenty-one thousand, four hundred seventy-three".