243403999049917 has 2 divisors, whose sum is σ = 243403999049918. Its totient is φ = 243403999049916.

The previous prime is 243403999049857. The next prime is 243403999049929. The reversal of 243403999049917 is 719940999304342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178801531845561 + 64602467204356 = 13371669^2 + 8037566^2 .

It is a cyclic number.

It is not a de Polignac number, because 243403999049917 - 2⁷ = 243403999049789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243403999049917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243403999049987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121701999524958 + 121701999524959.

It is an arithmetic number, because the mean of its divisors is an integer number (121701999524959).

Almost surely, 2^{243403999049917} is an apocalyptic number.

It is an amenable number.

243403999049917 is a deficient number, since it is larger than the sum of its proper divisors (1).

243403999049917 is an equidigital number, since it uses as much as digits as its factorization.

243403999049917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 476171136, while the sum is 73.

The spelling of 243403999049917 in words is "two hundred forty-three trillion, four hundred three billion, nine hundred ninety-nine million, forty-nine thousand, nine hundred seventeen".