131218198 has 16 divisors (see below), whose sum is σ = 204714576. Its totient is φ = 63030240.

The previous prime is 131218193. The next prime is 131218201. The reversal of 131218198 is 891812131.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131218193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7261 + ... + 17752.

It is an arithmetic number, because the mean of its divisors is an integer number (12794661).

Almost surely, 2^131218198 is an apocalyptic number.

131218198 is a deficient number, since it is larger than the sum of its proper divisors (73496378).

131218198 is a wasteful number, since it uses less digits than its factorization.

131218198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25119.

The product of its digits is 3456, while the sum is 34.

The square root of 131218198 is about 11455.0512002348. The cubic root of 131218198 is about 508.1571294576.

The spelling of 131218198 in words is "one hundred thirty-one million, two hundred eighteen thousand, one hundred ninety-eight".