243205642 has 4 divisors (see below), whose sum is σ = 364808466. Its totient is φ = 121602820.

The previous prime is 243205637. The next prime is 243205663. The reversal of 243205642 is 246502342.

243205642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 239599441 + 3606201 = 15479^2 + 1899^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 243205642.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60801409 + ... + 60801412.

Almost surely, 2^243205642 is an apocalyptic number.

243205642 is a deficient number, since it is larger than the sum of its proper divisors (121602824).

243205642 is a wasteful number, since it uses less digits than its factorization.

243205642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121602823.

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 243205642 is about 15595.0518434534. The cubic root of 243205642 is about 624.2011271586.

Adding to 243205642 its reverse (246502342), we get a palindrome (489707984).

The spelling of 243205642 in words is "two hundred forty-three million, two hundred five thousand, six hundred forty-two".