518668919 has 4 divisors (see below), whose sum is σ = 520687344. Its totient is φ = 516650496.

The previous prime is 518668907. The next prime is 518668993. The reversal of 518668919 is 919866815.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 518668919 - 2⁴ = 518668903 is a prime.

It is a super-2 number, since 2×518668919² = 538034895073257122, 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 (518668519) 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 in 3 ways as a sum of consecutive naturals, for example, 1008827 + ... + 1009340.

It is an arithmetic number, because the mean of its divisors is an integer number (130171836).

Almost surely, 2^518668919 is an apocalyptic number.

518668919 is a deficient number, since it is larger than the sum of its proper divisors (2018425).

518668919 is a wasteful number, since it uses less digits than its factorization.

518668919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2018424.

The product of its digits is 933120, while the sum is 53.

The square root of 518668919 is about 22774.3039191102. The cubic root of 518668919 is about 803.4584229069.

The spelling of 518668919 in words is "five hundred eighteen million, six hundred sixty-eight thousand, nine hundred nineteen".