518161813 has 8 divisors (see below), whose sum is σ = 571631256. Its totient is φ = 466636800.

The previous prime is 518161771. The next prime is 518161817. The reversal of 518161813 is 318161815.

It can be written as a sum of positive squares in 4 ways, for example, as 35129329 + 483032484 = 5927^2 + 21978^2 .

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 518161813 - 2²⁵ = 484607381 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 (518161817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 485548 + ... + 486613.

It is an arithmetic number, because the mean of its divisors is an integer number (71453907).

Almost surely, 2^518161813 is an apocalyptic number.

It is an amenable number.

518161813 is a deficient number, since it is larger than the sum of its proper divisors (53469443).

518161813 is a wasteful number, since it uses less digits than its factorization.

518161813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972215.

The product of its digits is 5760, while the sum is 34.

The square root of 518161813 is about 22763.1679034356. The cubic root of 518161813 is about 803.1964886689.

The spelling of 518161813 in words is "five hundred eighteen million, one hundred sixty-one thousand, eight hundred thirteen".