518918317 has 6 divisors (see below), whose sum is σ = 523052718. Its totient is φ = 514816344.

The previous prime is 518918311. The next prime is 518918357. The reversal of 518918317 is 713819815.

It can be written as a sum of positive squares in only one way, i.e., 423289476 + 95628841 = 20574^2 + 9779^2 .

It is not a de Polignac number, because 518918317 - 2²³ = 510529709 is a prime.

It is a super-2 number, since 2×518918317² = 538552439436224978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518918311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43 + ... + 32215.

It is an arithmetic number, because the mean of its divisors is an integer number (87175453).

Almost surely, 2^518918317 is an apocalyptic number.

It is an amenable number.

518918317 is a deficient number, since it is larger than the sum of its proper divisors (4134401).

518918317 is an equidigital number, since it uses as much as digits as its factorization.

518918317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32427 (or 32300 counting only the distinct ones).

The product of its digits is 60480, while the sum is 43.

The square root of 518918317 is about 22779.7786863701. The cubic root of 518918317 is about 803.5871812264.

The spelling of 518918317 in words is "five hundred eighteen million, nine hundred eighteen thousand, three hundred seventeen".