243326565 has 16 divisors (see below), whose sum is σ = 432580800. Its totient is φ = 129774096.

The previous prime is 243326549. The next prime is 243326569. The reversal of 243326565 is 565623342.

243326565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243326565 - 2⁴ = 243326549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243326569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 901075 + ... + 901344.

It is an arithmetic number, because the mean of its divisors is an integer number (27036300).

Almost surely, 2^243326565 is an apocalyptic number.

It is an amenable number.

243326565 is a deficient number, since it is larger than the sum of its proper divisors (189254235).

243326565 is a wasteful number, since it uses less digits than its factorization.

243326565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802433 (or 1802427 counting only the distinct ones).

The product of its digits is 129600, while the sum is 36.

The square root of 243326565 is about 15598.9283285744. The cubic root of 243326565 is about 624.3045619391.

The spelling of 243326565 in words is "two hundred forty-three million, three hundred twenty-six thousand, five hundred sixty-five".