518118989 has 2 divisors, whose sum is σ = 518118990. Its totient is φ = 518118988.

The previous prime is 518118977. The next prime is 518119039. The reversal of 518118989 is 989811815.

It is an a-pointer prime, because the next prime (518119039) can be obtained adding 518118989 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 429194089 + 88924900 = 20717^2 + 9430^2 .

It is a cyclic number.

It is not a de Polignac number, because 518118989 - 2¹² = 518114893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518118949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259059494 + 259059495.

It is an arithmetic number, because the mean of its divisors is an integer number (259059495).

Almost surely, 2^518118989 is an apocalyptic number.

It is an amenable number.

518118989 is a deficient number, since it is larger than the sum of its proper divisors (1).

518118989 is an equidigital number, since it uses as much as digits as its factorization.

518118989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 50.

The square root of 518118989 is about 22762.2272416387. The cubic root of 518118989 is about 803.1743610675.

The spelling of 518118989 in words is "five hundred eighteen million, one hundred eighteen thousand, nine hundred eighty-nine".