561630409 has 2 divisors, whose sum is σ = 561630410. Its totient is φ = 561630408.

The previous prime is 561630389. The next prime is 561630463. The reversal of 561630409 is 904036165.

561630409 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., 523128384 + 38502025 = 22872^2 + 6205^2 .

It is a cyclic number.

It is not a de Polignac number, because 561630409 - 2⁹ = 561629897 is a prime.

It is not a weakly prime, because it can be changed into another prime (561630109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280815204 + 280815205.

It is an arithmetic number, because the mean of its divisors is an integer number (280815205).

Almost surely, 2^561630409 is an apocalyptic number.

It is an amenable number.

561630409 is a deficient number, since it is larger than the sum of its proper divisors (1).

561630409 is an equidigital number, since it uses as much as digits as its factorization.

561630409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 561630409 is about 23698.7427725607. The cubic root of 561630409 is about 825.0562111684.

The spelling of 561630409 in words is "five hundred sixty-one million, six hundred thirty thousand, four hundred nine".