518108491 has 2 divisors, whose sum is σ = 518108492. Its totient is φ = 518108490.

The previous prime is 518108489. The next prime is 518108527. The reversal of 518108491 is 194801815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 518108491 - 2¹ = 518108489 is a prime.

Together with 518108489, it forms a pair of twin primes.

It is equal to p_27258364 and since 518108491 and 27258364 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 518108491.

It is not a weakly prime, because it can be changed into another prime (518108411) 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, 259054245 + 259054246.

It is an arithmetic number, because the mean of its divisors is an integer number (259054246).

Almost surely, 2^518108491 is an apocalyptic number.

518108491 is a deficient number, since it is larger than the sum of its proper divisors (1).

518108491 is an equidigital number, since it uses as much as digits as its factorization.

518108491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 37.

The square root of 518108491 is about 22761.9966391352. The cubic root of 518108491 is about 803.1689364569.

The spelling of 518108491 in words is "five hundred eighteen million, one hundred eight thousand, four hundred ninety-one".