518491 has 8 divisors (see below), whose sum is σ = 565200. Its totient is φ = 473760.

The previous prime is 518473. The next prime is 518509. The reversal of 518491 is 194815.

518491 = 30² + 31² + ... + 116².

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (518473) and next prime (518509).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 518491 - 2¹³ = 510299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518411) 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 in 7 ways as a sum of consecutive naturals, for example, 81 + ... + 1021.

It is an arithmetic number, because the mean of its divisors is an integer number (70650).

2⁵¹⁸⁴⁹¹ is an apocalyptic number.

518491 is a deficient number, since it is larger than the sum of its proper divisors (46709).

518491 is a wasteful number, since it uses less digits than its factorization.

518491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989.

The product of its digits is 1440, while the sum is 28.

The square root of 518491 is about 720.0631916714. The cubic root of 518491 is about 80.3366542286.

It can be divided in two parts, 5 and 18491, that added together give a square (18496 = 136²).

The spelling of 518491 in words is "five hundred eighteen thousand, four hundred ninety-one".