518980391 has 2 divisors, whose sum is σ = 518980392. Its totient is φ = 518980390.

The previous prime is 518980379. The next prime is 518980409. The reversal of 518980391 is 193089815.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-518980391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518980321) 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, 259490195 + 259490196.

It is an arithmetic number, because the mean of its divisors is an integer number (259490196).

Almost surely, 2^518980391 is an apocalyptic number.

518980391 is a deficient number, since it is larger than the sum of its proper divisors (1).

518980391 is an equidigital number, since it uses as much as digits as its factorization.

518980391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 44.

The square root of 518980391 is about 22781.1411259401. The cubic root of 518980391 is about 803.6192221599.

The spelling of 518980391 in words is "five hundred eighteen million, nine hundred eighty thousand, three hundred ninety-one".