243306838436939 has 2 divisors, whose sum is σ = 243306838436940. Its totient is φ = 243306838436938.

The previous prime is 243306838436821. The next prime is 243306838436983. The reversal of 243306838436939 is 939634838603342.

243306838436939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243306838436939 - 2²⁸ = 243306570001483 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (243306838436239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121653419218469 + 121653419218470.

It is an arithmetic number, because the mean of its divisors is an integer number (121653419218470).

Almost surely, 2^{243306838436939} is an apocalyptic number.

243306838436939 is a deficient number, since it is larger than the sum of its proper divisors (1).

243306838436939 is an equidigital number, since it uses as much as digits as its factorization.

243306838436939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451188224, while the sum is 71.

The spelling of 243306838436939 in words is "two hundred forty-three trillion, three hundred six billion, eight hundred thirty-eight million, four hundred thirty-six thousand, nine hundred thirty-nine".