518768491 has 2 divisors, whose sum is σ = 518768492. Its totient is φ = 518768490.

The previous prime is 518768489. The next prime is 518768543. The reversal of 518768491 is 194867815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 518768491 - 2¹ = 518768489 is a prime.

Together with 518768489, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (518718491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259384245 + 259384246.

It is an arithmetic number, because the mean of its divisors is an integer number (259384246).

Almost surely, 2^518768491 is an apocalyptic number.

518768491 is a deficient number, since it is larger than the sum of its proper divisors (1).

518768491 is an equidigital number, since it uses as much as digits as its factorization.

518768491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 49.

The square root of 518768491 is about 22776.4898744297. The cubic root of 518768491 is about 803.5098345366.

The spelling of 518768491 in words is "five hundred eighteen million, seven hundred sixty-eight thousand, four hundred ninety-one".