518327993 has 2 divisors, whose sum is σ = 518327994. Its totient is φ = 518327992.

The previous prime is 518327987. The next prime is 518328059. The reversal of 518327993 is 399723815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 379158784 + 139169209 = 19472^2 + 11797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-518327993 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (518327963) 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, 259163996 + 259163997.

It is an arithmetic number, because the mean of its divisors is an integer number (259163997).

Almost surely, 2^518327993 is an apocalyptic number.

It is an amenable number.

518327993 is a deficient number, since it is larger than the sum of its proper divisors (1).

518327993 is an equidigital number, since it uses as much as digits as its factorization.

518327993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 47.

The square root of 518327993 is about 22766.8178057453. The cubic root of 518327993 is about 803.2823440411.

The spelling of 518327993 in words is "five hundred eighteen million, three hundred twenty-seven thousand, nine hundred ninety-three".