243078661 has 12 divisors (see below), whose sum is σ = 285516192. Its totient is φ = 206326008.

The previous prime is 243078629. The next prime is 243078677. The reversal of 243078661 is 166870342.

243078661 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 243078661 - 2⁵ = 243078629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243078661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243078601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19035 + ... + 29128.

It is an arithmetic number, because the mean of its divisors is an integer number (23793016).

Almost surely, 2^243078661 is an apocalyptic number.

It is an amenable number.

243078661 is a deficient number, since it is larger than the sum of its proper divisors (42437531).

243078661 is a wasteful number, since it uses less digits than its factorization.

243078661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48280 (or 48273 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 243078661 is about 15590.9801167213. The cubic root of 243078661 is about 624.0924735911.

The spelling of 243078661 in words is "two hundred forty-three million, seventy-eight thousand, six hundred sixty-one".