518689549 has 18 divisors (see below), whose sum is σ = 609494730. Its totient is φ = 440125056.

The previous prime is 518689547. The next prime is 518689559. The reversal of 518689549 is 945986815.

It can be written as a sum of positive squares in 3 ways, for example, as 25050025 + 493639524 = 5005^2 + 22218^2 .

It is not a de Polignac number, because 518689549 - 2¹ = 518689547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 518689549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518689543) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 625267 + ... + 626095.

Almost surely, 2^518689549 is an apocalyptic number.

It is an amenable number.

518689549 is a deficient number, since it is larger than the sum of its proper divisors (90805181).

518689549 is an equidigital number, since it uses as much as digits as its factorization.

518689549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069 (or 949 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 55.

The square root of 518689549 is about 22774.7568373408. The cubic root of 518689549 is about 803.4690752562.

The spelling of 518689549 in words is "five hundred eighteen million, six hundred eighty-nine thousand, five hundred forty-nine".