243203113523 has 16 divisors (see below), whose sum is σ = 255073142016. Its totient is φ = 231669241440.

The previous prime is 243203113513. The next prime is 243203113547. The reversal of 243203113523 is 325311302342.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 243203113523 - 2¹⁰ = 243203112499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243203113513) 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, 61088 + ... + 700098.

It is an arithmetic number, because the mean of its divisors is an integer number (15942071376).

Almost surely, 2^243203113523 is an apocalyptic number.

243203113523 is a deficient number, since it is larger than the sum of its proper divisors (11870028493).

243203113523 is a wasteful number, since it uses less digits than its factorization.

243203113523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639274.

The product of its (nonzero) digits is 12960, while the sum is 29.

Adding to 243203113523 its reverse (325311302342), we get a palindrome (568514415865).

The spelling of 243203113523 in words is "two hundred forty-three billion, two hundred three million, one hundred thirteen thousand, five hundred twenty-three".