518689881 has 6 divisors (see below), whose sum is σ = 749218730. Its totient is φ = 345793248.

The previous prime is 518689879. The next prime is 518689901. The reversal of 518689881 is 188986815.

It can be written as a sum of positive squares in only one way, i.e., 516016656 + 2673225 = 22716^2 + 1635^2 .

It is not a de Polignac number, because 518689881 - 2¹ = 518689879 is a prime.

It is a super-2 number, since 2×518689881² = 538078385303588322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518689841) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28816096 + ... + 28816113.

Almost surely, 2^518689881 is an apocalyptic number.

It is an amenable number.

518689881 is a deficient number, since it is larger than the sum of its proper divisors (230528849).

518689881 is a wasteful number, since it uses less digits than its factorization.

518689881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57632215 (or 57632212 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 54.

The square root of 518689881 is about 22774.7641261112. The cubic root of 518689881 is about 803.4692466829.

The spelling of 518689881 in words is "five hundred eighteen million, six hundred eighty-nine thousand, eight hundred eighty-one".