243142123 has 4 divisors (see below), whose sum is σ = 277876720. Its totient is φ = 208407528.

The previous prime is 243142103. The next prime is 243142169. The reversal of 243142123 is 321241342.

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

It is not a de Polignac number, because 243142123 - 2¹³ = 243133931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243142094 and 243142103.

It is not an unprimeable number, because it can be changed into a prime (243142103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17367288 + ... + 17367301.

It is an arithmetic number, because the mean of its divisors is an integer number (69469180).

Almost surely, 2^243142123 is an apocalyptic number.

243142123 is a deficient number, since it is larger than the sum of its proper divisors (34734597).

243142123 is an equidigital number, since it uses as much as digits as its factorization.

243142123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34734596.

The product of its digits is 1152, while the sum is 22.

The square root of 243142123 is about 15593.0151991204. The cubic root of 243142123 is about 624.1467807170.

Adding to 243142123 its reverse (321241342), we get a palindrome (564383465).

The spelling of 243142123 in words is "two hundred forty-three million, one hundred forty-two thousand, one hundred twenty-three".