518718491 has 2 divisors, whose sum is σ = 518718492. Its totient is φ = 518718490.

The previous prime is 518718479. The next prime is 518718493. The reversal of 518718491 is 194817815.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 518718491 - 2⁶ = 518718427 is a prime.

Together with 518718493, 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 (518718493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259359245 + 259359246.

It is an arithmetic number, because the mean of its divisors is an integer number (259359246).

Almost surely, 2^518718491 is an apocalyptic number.

518718491 is a deficient number, since it is larger than the sum of its proper divisors (1).

518718491 is an equidigital number, since it uses as much as digits as its factorization.

518718491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 44.

The square root of 518718491 is about 22775.3922249431. The cubic root of 518718491 is about 803.4840190503.

The spelling of 518718491 in words is "five hundred eighteen million, seven hundred eighteen thousand, four hundred ninety-one".