518989643 has 4 divisors (see below), whose sum is σ = 522951528. Its totient is φ = 515027760.

The previous prime is 518989637. The next prime is 518989649. The reversal of 518989643 is 346989815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346989815 = 5 ⋅69397963.

It is an interprime number because it is at equal distance from previous prime (518989637) and next prime (518989649).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-518989643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518989649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1980746 + ... + 1981007.

It is an arithmetic number, because the mean of its divisors is an integer number (130737882).

Almost surely, 2^518989643 is an apocalyptic number.

518989643 is a deficient number, since it is larger than the sum of its proper divisors (3961885).

518989643 is a wasteful number, since it uses less digits than its factorization.

518989643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3961884.

The product of its digits is 1866240, while the sum is 53.

The square root of 518989643 is about 22781.3441877340. The cubic root of 518989643 is about 803.6239975753.

The spelling of 518989643 in words is "five hundred eighteen million, nine hundred eighty-nine thousand, six hundred forty-three".