518009857 has 4 divisors (see below), whose sum is σ = 519421696. Its totient is φ = 516598020.

The previous prime is 518009819. The next prime is 518009893. The reversal of 518009857 is 758900815.

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, and also an emirpimes, since its reverse is a distinct semiprime: 758900815 = 5 ⋅151780163.

It is a cyclic number.

It is not a de Polignac number, because 518009857 - 2⁷ = 518009729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518004857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705369 + ... + 706102.

It is an arithmetic number, because the mean of its divisors is an integer number (129855424).

Almost surely, 2^518009857 is an apocalyptic number.

It is an amenable number.

518009857 is a deficient number, since it is larger than the sum of its proper divisors (1411839).

518009857 is a wasteful number, since it uses less digits than its factorization.

518009857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411838.

The product of its (nonzero) digits is 100800, while the sum is 43.

The square root of 518009857 is about 22759.8298983099. The cubic root of 518009857 is about 803.1179659273.

The spelling of 518009857 in words is "five hundred eighteen million, nine thousand, eight hundred fifty-seven".