318243418721 has 2 divisors, whose sum is σ = 318243418722. Its totient is φ = 318243418720.

The previous prime is 318243418711. The next prime is 318243418741. The reversal of 318243418721 is 127814342813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252645964321 + 65597454400 = 502639^2 + 256120^2 .

It is an emirp because it is prime and its reverse (127814342813) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318243418721 is a prime.

It is not a weakly prime, because it can be changed into another prime (318243418711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159121709360 + 159121709361.

It is an arithmetic number, because the mean of its divisors is an integer number (159121709361).

Almost surely, 2^318243418721 is an apocalyptic number.

It is an amenable number.

318243418721 is a deficient number, since it is larger than the sum of its proper divisors (1).

318243418721 is an equidigital number, since it uses as much as digits as its factorization.

318243418721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 44.

The spelling of 318243418721 in words is "three hundred eighteen billion, two hundred forty-three million, four hundred eighteen thousand, seven hundred twenty-one".