243042123 has 16 divisors (see below), whose sum is σ = 333089280. Its totient is φ = 157556256.

The previous prime is 243042119. The next prime is 243042161. The reversal of 243042123 is 321240342.

It is not a de Polignac number, because 243042123 - 2² = 243042119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243042123.

It is not an unprimeable number, because it can be changed into a prime (243042103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16648 + ... + 27626.

It is an arithmetic number, because the mean of its divisors is an integer number (20818080).

Almost surely, 2^243042123 is an apocalyptic number.

243042123 is a deficient number, since it is larger than the sum of its proper divisors (90047157).

243042123 is a wasteful number, since it uses less digits than its factorization.

243042123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11186.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 243042123 is about 15589.8083054283. The cubic root of 243042123 is about 624.0612021866.

Adding to 243042123 its reverse (321240342), we get a palindrome (564282465).

The spelling of 243042123 in words is "two hundred forty-three million, forty-two thousand, one hundred twenty-three".