243315018 has 12 divisors (see below), whose sum is σ = 527182578. Its totient is φ = 81105000.

The previous prime is 243315013. The next prime is 243315029. The reversal of 243315018 is 810513342.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 237683889 + 5631129 = 15417^2 + 2373^2 .

It is a junction number, because it is equal to n+sod(n) for n = 243314982 and 243315000.

It is not an unprimeable number, because it can be changed into a prime (243315013) 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 5 ways as a sum of consecutive naturals, for example, 6758733 + ... + 6758768.

Almost surely, 2^243315018 is an apocalyptic number.

243315018 is an abundant number, since it is smaller than the sum of its proper divisors (283867560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243315018 is a wasteful number, since it uses less digits than its factorization.

243315018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13517509 (or 13517506 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 243315018 is about 15598.5582026032. The cubic root of 243315018 is about 624.2946863784.

The spelling of 243315018 in words is "two hundred forty-three million, three hundred fifteen thousand, eighteen".