243664545 has 16 divisors (see below), whose sum is σ = 395356032. Its totient is φ = 128123520.

The previous prime is 243664541. The next prime is 243664609. The reversal of 243664545 is 545466342.

It is not a de Polignac number, because 243664545 - 2² = 243664541 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243664541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113332 + ... + 115461.

It is an arithmetic number, because the mean of its divisors is an integer number (24709752).

Almost surely, 2^243664545 is an apocalyptic number.

It is an amenable number.

243664545 is a deficient number, since it is larger than the sum of its proper divisors (151691487).

243664545 is a wasteful number, since it uses less digits than its factorization.

243664545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228872.

The product of its digits is 345600, while the sum is 39.

The square root of 243664545 is about 15609.7580058116. The cubic root of 243664545 is about 624.5934807113.

The spelling of 243664545 in words is "two hundred forty-three million, six hundred sixty-four thousand, five hundred forty-five".