243005323307513 has 4 divisors (see below), whose sum is σ = 261698040485028. Its totient is φ = 224312606130000.

The previous prime is 243005323307503. The next prime is 243005323307623. The reversal of 243005323307513 is 315703323500342.

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

It can be written as a sum of positive squares in 2 ways, for example, as 115947519659449 + 127057803648064 = 10767893^2 + 11271992^2 .

It is a cyclic number.

It is not a de Polignac number, because 243005323307513 - 2³⁰ = 243004249565689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243005323307503) 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, 9346358588738 + ... + 9346358588763.

It is an arithmetic number, because the mean of its divisors is an integer number (65424510121257).

Almost surely, 2^{243005323307513} is an apocalyptic number.

It is an amenable number.

243005323307513 is a deficient number, since it is larger than the sum of its proper divisors (18692717177515).

243005323307513 is a wasteful number, since it uses less digits than its factorization.

243005323307513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18692717177514.

The product of its (nonzero) digits is 680400, while the sum is 41.

Adding to 243005323307513 its reverse (315703323500342), we get a palindrome (558708646807855).

The spelling of 243005323307513 in words is "two hundred forty-three trillion, five billion, three hundred twenty-three million, three hundred seven thousand, five hundred thirteen".