243374975917 has 2 divisors, whose sum is σ = 243374975918. Its totient is φ = 243374975916.

The previous prime is 243374975891. The next prime is 243374975933. The reversal of 243374975917 is 719579473342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186325175716 + 57049800201 = 431654^2 + 238851^2 .

It is a cyclic number.

It is not a de Polignac number, because 243374975917 - 2¹⁹ = 243374451629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243374973917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121687487958 + 121687487959.

It is an arithmetic number, because the mean of its divisors is an integer number (121687487959).

Almost surely, 2^243374975917 is an apocalyptic number.

It is an amenable number.

243374975917 is a deficient number, since it is larger than the sum of its proper divisors (1).

243374975917 is an equidigital number, since it uses as much as digits as its factorization.

243374975917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40007520, while the sum is 61.

The spelling of 243374975917 in words is "two hundred forty-three billion, three hundred seventy-four million, nine hundred seventy-five thousand, nine hundred seventeen".