243437391943 has 2 divisors, whose sum is σ = 243437391944. Its totient is φ = 243437391942.

The previous prime is 243437391893. The next prime is 243437391949. The reversal of 243437391943 is 349193734342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243437391943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243437391949) 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 as a sum of consecutive naturals, namely, 121718695971 + 121718695972.

It is an arithmetic number, because the mean of its divisors is an integer number (121718695972).

Almost surely, 2^243437391943 is an apocalyptic number.

243437391943 is a deficient number, since it is larger than the sum of its proper divisors (1).

243437391943 is an equidigital number, since it uses as much as digits as its factorization.

243437391943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 52.

The spelling of 243437391943 in words is "two hundred forty-three billion, four hundred thirty-seven million, three hundred ninety-one thousand, nine hundred forty-three".