518204993 has 4 divisors (see below), whose sum is σ = 545478960. Its totient is φ = 490931028.

The previous prime is 518204969. The next prime is 518205047. The reversal of 518204993 is 399402815.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 518204993 - 2⁸ = 518204737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 518204993.

It is not an unprimeable number, because it can be changed into a prime (518204923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13636955 + ... + 13636992.

It is an arithmetic number, because the mean of its divisors is an integer number (136369740).

Almost surely, 2^518204993 is an apocalyptic number.

It is an amenable number.

518204993 is a deficient number, since it is larger than the sum of its proper divisors (27273967).

518204993 is a wasteful number, since it uses less digits than its factorization.

518204993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27273966.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 518204993 is about 22764.1163456876. The cubic root of 518204993 is about 803.2187989846.

The spelling of 518204993 in words is "five hundred eighteen million, two hundred four thousand, nine hundred ninety-three".