518189991 has 16 divisors (see below), whose sum is σ = 754364928. Its totient is φ = 313790400.

The previous prime is 518189981. The next prime is 518190011. The reversal of 518189991 is 199981815.

It is not a de Polignac number, because 518189991 - 2¹⁸ = 517927847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518189981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37650 + ... + 49536.

It is an arithmetic number, because the mean of its divisors is an integer number (47147808).

Almost surely, 2^518189991 is an apocalyptic number.

518189991 is a deficient number, since it is larger than the sum of its proper divisors (236174937).

518189991 is a wasteful number, since it uses less digits than its factorization.

518189991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13222.

The product of its digits is 233280, while the sum is 51.

The square root of 518189991 is about 22763.7868334774. The cubic root of 518189991 is about 803.2110478663.

The spelling of 518189991 in words is "five hundred eighteen million, one hundred eighty-nine thousand, nine hundred ninety-one".