518857117 has 2 divisors, whose sum is σ = 518857118. Its totient is φ = 518857116.

The previous prime is 518857109. The next prime is 518857133. The reversal of 518857117 is 711758815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 487261476 + 31595641 = 22074^2 + 5621^2 .

It is a cyclic number.

It is not a de Polignac number, because 518857117 - 2³ = 518857109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518857217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259428558 + 259428559.

It is an arithmetic number, because the mean of its divisors is an integer number (259428559).

Almost surely, 2^518857117 is an apocalyptic number.

It is an amenable number.

518857117 is a deficient number, since it is larger than the sum of its proper divisors (1).

518857117 is an equidigital number, since it uses as much as digits as its factorization.

518857117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78400, while the sum is 43.

The square root of 518857117 is about 22778.4353501289. The cubic root of 518857117 is about 803.5555889267. Note that the first 4 decimals are identical.

The spelling of 518857117 in words is "five hundred eighteen million, eight hundred fifty-seven thousand, one hundred seventeen".