243688545 has 24 divisors (see below), whose sum is σ = 425443200. Its totient is φ = 129028896.

The previous prime is 243688531. The next prime is 243688559. The reversal of 243688545 is 545886342.

243688545 is a `hidden beast` number, since 2 + 43 + 68 + 8 + 545 = 666.

It is an interprime number because it is at equal distance from previous prime (243688531) and next prime (243688559).

It is not a de Polignac number, because 243688545 - 2¹² = 243684449 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 243688545.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13225 + ... + 25734.

It is an arithmetic number, because the mean of its divisors is an integer number (17726800).

Almost surely, 2^243688545 is an apocalyptic number.

It is an amenable number.

243688545 is a deficient number, since it is larger than the sum of its proper divisors (181754655).

243688545 is a wasteful number, since it uses less digits than its factorization.

243688545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39109 (or 39106 counting only the distinct ones).

The product of its digits is 921600, while the sum is 45.

The square root of 243688545 is about 15610.5267367889. The cubic root of 243688545 is about 624.6139867057.

The spelling of 243688545 in words is "two hundred forty-three million, six hundred eighty-eight thousand, five hundred forty-five".