518197213 has 8 divisors (see below), whose sum is σ = 549506808. Its totient is φ = 486979584.

The previous prime is 518197187. The next prime is 518197283. The reversal of 518197213 is 312791815.

It can be written as a sum of positive squares in 4 ways, for example, as 130028409 + 388168804 = 11403^2 + 19702^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-518197213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518197283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11206 + ... + 34087.

It is an arithmetic number, because the mean of its divisors is an integer number (68688351).

Almost surely, 2^518197213 is an apocalyptic number.

It is an amenable number.

518197213 is a deficient number, since it is larger than the sum of its proper divisors (31309595).

518197213 is a wasteful number, since it uses less digits than its factorization.

518197213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45983.

The product of its digits is 15120, while the sum is 37.

The square root of 518197213 is about 22763.9454620679. The cubic root of 518197213 is about 803.2147792926.

The spelling of 518197213 in words is "five hundred eighteen million, one hundred ninety-seven thousand, two hundred thirteen".