561025009 has 2 divisors, whose sum is σ = 561025010. Its totient is φ = 561025008.

The previous prime is 561024953. The next prime is 561025019. The reversal of 561025009 is 900520165.

561025009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 327791025 + 233233984 = 18105^2 + 15272^2 .

It is a cyclic number.

It is not a de Polignac number, because 561025009 - 2⁷ = 561024881 is a prime.

It is not a weakly prime, because it can be changed into another prime (561025019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280512504 + 280512505.

It is an arithmetic number, because the mean of its divisors is an integer number (280512505).

Almost surely, 2^561025009 is an apocalyptic number.

It is an amenable number.

561025009 is a deficient number, since it is larger than the sum of its proper divisors (1).

561025009 is an equidigital number, since it uses as much as digits as its factorization.

561025009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 561025009 is about 23685.9664991741. The cubic root of 561025009 is about 824.7596527903.

The spelling of 561025009 in words is "five hundred sixty-one million, twenty-five thousand, nine".