518861 has 6 divisors (see below), whose sum is σ = 603630. Its totient is φ = 444696.

The previous prime is 518831. The next prime is 518863. The reversal of 518861 is 168815.

It can be written as a sum of positive squares in only one way, i.e., 354025 + 164836 = 595^2 + 406^2 .

It is a de Polignac number, because none of the positive numbers 2^k-518861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5246 + ... + 5343.

It is an arithmetic number, because the mean of its divisors is an integer number (100605).

2⁵¹⁸⁸⁶¹ is an apocalyptic number.

It is an amenable number.

518861 is a deficient number, since it is larger than the sum of its proper divisors (84769).

518861 is a wasteful number, since it uses less digits than its factorization.

518861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10603 (or 10596 counting only the distinct ones).

The product of its digits is 1920, while the sum is 29.

The square root of 518861 is about 720.3200677477. The cubic root of 518861 is about 80.3557593460.

The spelling of 518861 in words is "five hundred eighteen thousand, eight hundred sixty-one".