518649 has 4 divisors (see below), whose sum is σ = 691536. Its totient is φ = 345764.

The previous prime is 518621. The next prime is 518657. The reversal of 518649 is 946815.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 518649 - 2⁷ = 518521 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (518689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86439 + ... + 86444.

It is an arithmetic number, because the mean of its divisors is an integer number (172884).

2⁵¹⁸⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

518649 is a deficient number, since it is larger than the sum of its proper divisors (172887).

518649 is a wasteful number, since it uses less digits than its factorization.

518649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172886.

The product of its digits is 8640, while the sum is 33.

The square root of 518649 is about 720.1728959076. The cubic root of 518649 is about 80.3448137416.

The spelling of 518649 in words is "five hundred eighteen thousand, six hundred forty-nine".