243105242 has 4 divisors (see below), whose sum is σ = 364657866. Its totient is φ = 121552620.

The previous prime is 243105229. The next prime is 243105259. The reversal of 243105242 is 242501342.

It is a happy number.

243105242 is digitally balanced in base 3, 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, and also an emirpimes, since its reverse is a distinct semiprime: 242501342 = 2 ⋅121250671.

It can be written as a sum of positive squares in only one way, i.e., 139452481 + 103652761 = 11809^2 + 10181^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60776309 + ... + 60776312.

Almost surely, 2^243105242 is an apocalyptic number.

243105242 is a deficient number, since it is larger than the sum of its proper divisors (121552624).

243105242 is a wasteful number, since it uses less digits than its factorization.

243105242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121552623.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 243105242 is about 15591.8325414301. The cubic root of 243105242 is about 624.1152212308.

Adding to 243105242 its reverse (242501342), we get a palindrome (485606584).

The spelling of 243105242 in words is "two hundred forty-three million, one hundred five thousand, two hundred forty-two".