243740051543 has 2 divisors, whose sum is σ = 243740051544. Its totient is φ = 243740051542.

The previous prime is 243740051339. The next prime is 243740051551. The reversal of 243740051543 is 345150047342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243740051543 - 2⁸ = 243740051287 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 243740051497 and 243740051506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243740051563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121870025771 + 121870025772.

It is an arithmetic number, because the mean of its divisors is an integer number (121870025772).

Almost surely, 2^243740051543 is an apocalyptic number.

243740051543 is a deficient number, since it is larger than the sum of its proper divisors (1).

243740051543 is an equidigital number, since it uses as much as digits as its factorization.

243740051543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 38.

Adding to 243740051543 its reverse (345150047342), we get a palindrome (588890098885).

The spelling of 243740051543 in words is "two hundred forty-three billion, seven hundred forty million, fifty-one thousand, five hundred forty-three".