518031989 has 2 divisors, whose sum is σ = 518031990. Its totient is φ = 518031988.

The previous prime is 518031971. The next prime is 518032003. The reversal of 518031989 is 989130815.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 262991089 + 255040900 = 16217^2 + 15970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-518031989 is a prime.

It is a super-2 number, since 2×518031989² = 536714283254592242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518036989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259015994 + 259015995.

It is an arithmetic number, because the mean of its divisors is an integer number (259015995).

Almost surely, 2^518031989 is an apocalyptic number.

It is an amenable number.

518031989 is a deficient number, since it is larger than the sum of its proper divisors (1).

518031989 is an equidigital number, since it uses as much as digits as its factorization.

518031989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 44.

The square root of 518031989 is about 22760.3161006169. The cubic root of 518031989 is about 803.1294035177.

The spelling of 518031989 in words is "five hundred eighteen million, thirty-one thousand, nine hundred eighty-nine".