518193689 has 8 divisors (see below), whose sum is σ = 564326280. Its totient is φ = 472957056.

The previous prime is 518193679. The next prime is 518193727. The reversal of 518193689 is 986391815.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2131600 + 516062089 = 1460^2 + 22717^2 .

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

It is not a de Polignac number, because 518193689 - 2¹² = 518189593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518193649) 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, 222782 + ... + 225095.

It is an arithmetic number, because the mean of its divisors is an integer number (70540785).

Almost surely, 2^518193689 is an apocalyptic number.

It is an amenable number.

518193689 is a deficient number, since it is larger than the sum of its proper divisors (46132591).

518193689 is a wasteful number, since it uses less digits than its factorization.

518193689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447979.

The product of its digits is 466560, while the sum is 50.

The square root of 518193689 is about 22763.8680588339. The cubic root of 518193689 is about 803.2129585345.

The spelling of 518193689 in words is "five hundred eighteen million, one hundred ninety-three thousand, six hundred eighty-nine".