491214818 has 16 divisors (see below), whose sum is σ = 795372480. Its totient is φ = 226827216.

The previous prime is 491214817. The next prime is 491214821. The reversal of 491214818 is 818412194.

It is not an unprimeable number, because it can be changed into a prime (491214817) 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 in 7 ways as a sum of consecutive naturals, for example, 182780 + ... + 185447.

It is an arithmetic number, because the mean of its divisors is an integer number (49710780).

Almost surely, 2^491214818 is an apocalyptic number.

491214818 is a deficient number, since it is larger than the sum of its proper divisors (304157662).

491214818 is a wasteful number, since it uses less digits than its factorization.

491214818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368281.

The product of its digits is 18432, while the sum is 38.

The square root of 491214818 is about 22163.3665764026. The cubic root of 491214818 is about 789.0244958696.

The spelling of 491214818 in words is "four hundred ninety-one million, two hundred fourteen thousand, eight hundred eighteen".