518918717 has 2 divisors, whose sum is σ = 518918718. Its totient is φ = 518918716.

The previous prime is 518918651. The next prime is 518918731. The reversal of 518918717 is 717819815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 455779801 + 63138916 = 21349^2 + 7946^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-518918717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518918737) 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, 259459358 + 259459359.

It is an arithmetic number, because the mean of its divisors is an integer number (259459359).

Almost surely, 2^518918717 is an apocalyptic number.

It is an amenable number.

518918717 is a deficient number, since it is larger than the sum of its proper divisors (1).

518918717 is an equidigital number, since it uses as much as digits as its factorization.

518918717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 47.

The square root of 518918717 is about 22779.7874660849. The cubic root of 518918717 is about 803.5873877038.

The spelling of 518918717 in words is "five hundred eighteen million, nine hundred eighteen thousand, seven hundred seventeen".