243787538941 has 4 divisors (see below), whose sum is σ = 244210048252. Its totient is φ = 243365029632.

The previous prime is 243787538921. The next prime is 243787538977. The reversal of 243787538941 is 149835787342.

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 206521166916 + 37266372025 = 454446^2 + 193045^2 .

It is a cyclic number.

It is not a de Polignac number, because 243787538941 - 2¹¹ = 243787536893 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 243787538941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243787538921) 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, 211253790 + ... + 211254943.

It is an arithmetic number, because the mean of its divisors is an integer number (61052512063).

Almost surely, 2^243787538941 is an apocalyptic number.

It is an amenable number.

243787538941 is a deficient number, since it is larger than the sum of its proper divisors (422509311).

243787538941 is an equidigital number, since it uses as much as digits as its factorization.

243787538941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422509310.

The product of its digits is 40642560, while the sum is 61.

The spelling of 243787538941 in words is "two hundred forty-three billion, seven hundred eighty-seven million, five hundred thirty-eight thousand, nine hundred forty-one".