265416509 has 2 divisors, whose sum is σ = 265416510. Its totient is φ = 265416508.

The previous prime is 265416499. The next prime is 265416517. The reversal of 265416509 is 905614562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204919225 + 60497284 = 14315^2 + 7778^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265416509 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265416709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132708254 + 132708255.

It is an arithmetic number, because the mean of its divisors is an integer number (132708255).

Almost surely, 2^265416509 is an apocalyptic number.

It is an amenable number.

265416509 is a deficient number, since it is larger than the sum of its proper divisors (1).

265416509 is an equidigital number, since it uses as much as digits as its factorization.

265416509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 265416509 is about 16291.6085455059. The cubic root of 265416509 is about 642.6521688359.

The spelling of 265416509 in words is "two hundred sixty-five million, four hundred sixteen thousand, five hundred nine".