491800218 has 64 divisors (see below), whose sum is σ = 1274327040. Its totient is φ = 122876352.

The previous prime is 491800193. The next prime is 491800219. The reversal of 491800218 is 812008194.

It is not an unprimeable number, because it can be changed into a prime (491800219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13330 + ... + 34077.

It is an arithmetic number, because the mean of its divisors is an integer number (19911360).

Almost surely, 2^491800218 is an apocalyptic number.

491800218 is an abundant number, since it is smaller than the sum of its proper divisors (782526822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491800218 is a wasteful number, since it uses less digits than its factorization.

491800218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47451.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 491800218 is about 22176.5691214850. The cubic root of 491800218 is about 789.3378086052.

The spelling of 491800218 in words is "four hundred ninety-one million, eight hundred thousand, two hundred eighteen".