518840491 has 16 divisors (see below), whose sum is σ = 563886400. Its totient is φ = 474553728.

The previous prime is 518840489. The next prime is 518840533. The reversal of 518840491 is 194048815.

It is a cyclic number.

It is not a de Polignac number, because 518840491 - 2¹ = 518840489 is a prime.

It is a super-2 number, since 2×518840491² = 538390910202242162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518840401) 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 15 ways as a sum of consecutive naturals, for example, 1181650 + ... + 1182088.

It is an arithmetic number, because the mean of its divisors is an integer number (35242900).

Almost surely, 2^518840491 is an apocalyptic number.

518840491 is a deficient number, since it is larger than the sum of its proper divisors (45045909).

518840491 is a wasteful number, since it uses less digits than its factorization.

518840491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 518840491 is about 22778.0703967654. The cubic root of 518840491 is about 803.5470059228.

The spelling of 518840491 in words is "five hundred eighteen million, eight hundred forty thousand, four hundred ninety-one".