243113657123 has 4 divisors (see below), whose sum is σ = 243144567960. Its totient is φ = 243082746288.

The previous prime is 243113657119. The next prime is 243113657159. The reversal of 243113657123 is 321756311342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321756311342 = 2 ⋅160878155671.

It is a cyclic number.

It is not a de Polignac number, because 243113657123 - 2² = 243113657119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243113657323) 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, 15443618 + ... + 15459351.

It is an arithmetic number, because the mean of its divisors is an integer number (60786141990).

Almost surely, 2^243113657123 is an apocalyptic number.

243113657123 is a deficient number, since it is larger than the sum of its proper divisors (30910837).

243113657123 is an equidigital number, since it uses as much as digits as its factorization.

243113657123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30910836.

The product of its digits is 90720, while the sum is 38.

Adding to 243113657123 its reverse (321756311342), we get a palindrome (564869968465).

The spelling of 243113657123 in words is "two hundred forty-three billion, one hundred thirteen million, six hundred fifty-seven thousand, one hundred twenty-three".