243005320543 has 4 divisors (see below), whose sum is σ = 248175646560. Its totient is φ = 237834994528.

The previous prime is 243005320531. The next prime is 243005320553. The reversal of 243005320543 is 345023500342.

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

It is a cyclic number.

It is not a de Polignac number, because 243005320543 - 2²⁵ = 242971766111 is a prime.

It is a super-4 number, since 4×243005320543⁴ (a number of 47 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243005320553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2585162938 + ... + 2585163031.

It is an arithmetic number, because the mean of its divisors is an integer number (62043911640).

Almost surely, 2^243005320543 is an apocalyptic number.

243005320543 is a deficient number, since it is larger than the sum of its proper divisors (5170326017).

243005320543 is an equidigital number, since it uses as much as digits as its factorization.

243005320543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5170326016.

The product of its (nonzero) digits is 43200, while the sum is 31.

Adding to 243005320543 its reverse (345023500342), we get a palindrome (588028820885).

The spelling of 243005320543 in words is "two hundred forty-three billion, five million, three hundred twenty thousand, five hundred forty-three".