131818198 has 32 divisors (see below), whose sum is σ = 217183680. Its totient is φ = 59811840.

The previous prime is 131818189. The next prime is 131818201. The reversal of 131818198 is 891818131.

It is a self number, because there is not a number n which added to its sum of digits gives 131818198.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 68838 + ... + 70726.

It is an arithmetic number, because the mean of its divisors is an integer number (6786990).

Almost surely, 2^131818198 is an apocalyptic number.

131818198 is a deficient number, since it is larger than the sum of its proper divisors (85365482).

131818198 is a wasteful number, since it uses less digits than its factorization.

131818198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992.

The product of its digits is 13824, while the sum is 40.

The square root of 131818198 is about 11481.2106504497. The cubic root of 131818198 is about 508.9304742778.

The spelling of 131818198 in words is "one hundred thirty-one million, eight hundred eighteen thousand, one hundred ninety-eight".