243425873809 has 2 divisors, whose sum is σ = 243425873810. Its totient is φ = 243425873808.

The previous prime is 243425873807. The next prime is 243425873837. The reversal of 243425873809 is 908378524342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197242574400 + 46183299409 = 444120^2 + 214903^2 .

It is a cyclic number.

It is not a de Polignac number, because 243425873809 - 2¹ = 243425873807 is a prime.

Together with 243425873807, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 243425873809.

It is not a weakly prime, because it can be changed into another prime (243425873807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121712936904 + 121712936905.

It is an arithmetic number, because the mean of its divisors is an integer number (121712936905).

Almost surely, 2^243425873809 is an apocalyptic number.

It is an amenable number.

243425873809 is a deficient number, since it is larger than the sum of its proper divisors (1).

243425873809 is an equidigital number, since it uses as much as digits as its factorization.

243425873809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11612160, while the sum is 55.

The spelling of 243425873809 in words is "two hundred forty-three billion, four hundred twenty-five million, eight hundred seventy-three thousand, eight hundred nine".