518989 has 2 divisors, whose sum is σ = 518990. Its totient is φ = 518988.

The previous prime is 518983. The next prime is 519011. The reversal of 518989 is 989815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514089 + 4900 = 717^2 + 70^2 .

It is a cyclic number.

It is not a de Polignac number, because 518989 - 2³ = 518981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518981) 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 as a sum of consecutive naturals, namely, 259494 + 259495.

It is an arithmetic number, because the mean of its divisors is an integer number (259495).

2⁵¹⁸⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

518989 is a deficient number, since it is larger than the sum of its proper divisors (1).

518989 is an equidigital number, since it uses as much as digits as its factorization.

518989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 40.

The square root of 518989 is about 720.4089116606. The cubic root of 518989 is about 80.3623665693.

The spelling of 518989 in words is "five hundred eighteen thousand, nine hundred eighty-nine".