265604609 has 2 divisors, whose sum is σ = 265604610. Its totient is φ = 265604608.

The previous prime is 265604597. The next prime is 265604627. The reversal of 265604609 is 906406562.

265604609 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., 175297600 + 90307009 = 13240^2 + 9503^2 .

It is a cyclic number.

It is not a de Polignac number, because 265604609 - 2²⁴ = 248827393 is a prime.

It is not a weakly prime, because it can be changed into another prime (265604639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132802304 + 132802305.

It is an arithmetic number, because the mean of its divisors is an integer number (132802305).

Almost surely, 2^265604609 is an apocalyptic number.

It is an amenable number.

265604609 is a deficient number, since it is larger than the sum of its proper divisors (1).

265604609 is an equidigital number, since it uses as much as digits as its factorization.

265604609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 265604609 is about 16297.3804336771. The cubic root of 265604609 is about 642.8039483015.

The spelling of 265604609 in words is "two hundred sixty-five million, six hundred four thousand, six hundred nine".