265390409 has 2 divisors, whose sum is σ = 265390410. Its totient is φ = 265390408.

The previous prime is 265390393. The next prime is 265390421. The reversal of 265390409 is 904093562.

265390409 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., 255904009 + 9486400 = 15997^2 + 3080^2 .

It is a cyclic number.

It is not a de Polignac number, because 265390409 - 2⁴ = 265390393 is a prime.

It is not a weakly prime, because it can be changed into another prime (265390439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132695204 + 132695205.

It is an arithmetic number, because the mean of its divisors is an integer number (132695205).

Almost surely, 2^265390409 is an apocalyptic number.

It is an amenable number.

265390409 is a deficient number, since it is larger than the sum of its proper divisors (1).

265390409 is an equidigital number, since it uses as much as digits as its factorization.

265390409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 265390409 is about 16290.8074999369. The cubic root of 265390409 is about 642.6311028624.

The spelling of 265390409 in words is "two hundred sixty-five million, three hundred ninety thousand, four hundred nine".