42565009 has 2 divisors, whose sum is σ = 42565010. Its totient is φ = 42565008.

The previous prime is 42564983. The next prime is 42565031. The reversal of 42565009 is 90056524.

42565009 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., 30558784 + 12006225 = 5528^2 + 3465^2 .

It is a cyclic number.

It is not a de Polignac number, because 42565009 - 2¹⁹ = 42040721 is a prime.

It is not a weakly prime, because it can be changed into another prime (42565049) 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, 21282504 + 21282505.

It is an arithmetic number, because the mean of its divisors is an integer number (21282505).

Almost surely, 2^42565009 is an apocalyptic number.

It is an amenable number.

42565009 is a deficient number, since it is larger than the sum of its proper divisors (1).

42565009 is an equidigital number, since it uses as much as digits as its factorization.

42565009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 42565009 is about 6524.1864626940. The cubic root of 42565009 is about 349.1544459724.

The spelling of 42565009 in words is "forty-two million, five hundred sixty-five thousand, nine".