123243542114243 has 4 divisors (see below), whose sum is σ = 123443288536440. Its totient is φ = 123043795692048.

The previous prime is 123243542114191. The next prime is 123243542114257. The reversal of 123243542114243 is 342411245342321.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123243542114243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123243542114243.

It is not an unprimeable number, because it can be changed into a prime (123243542114293) 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, 99873210173 + ... + 99873211406.

It is an arithmetic number, because the mean of its divisors is an integer number (30860822134110).

Almost surely, 2^{123243542114243} is an apocalyptic number.

123243542114243 is a deficient number, since it is larger than the sum of its proper divisors (199746422197).

123243542114243 is an equidigital number, since it uses as much as digits as its factorization.

123243542114243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199746422196.

The product of its digits is 552960, while the sum is 41.

Adding to 123243542114243 its reverse (342411245342321), we get a palindrome (465654787456564).

The spelling of 123243542114243 in words is "one hundred twenty-three trillion, two hundred forty-three billion, five hundred forty-two million, one hundred fourteen thousand, two hundred forty-three".