131221198 has 8 divisors (see below), whose sum is σ = 208410192. Its totient is φ = 61751136.

The previous prime is 131221193. The next prime is 131221213. The reversal of 131221198 is 891122131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1929690 + ... + 1929757.

It is an arithmetic number, because the mean of its divisors is an integer number (26051274).

Almost surely, 2^131221198 is an apocalyptic number.

131221198 is a deficient number, since it is larger than the sum of its proper divisors (77188994).

131221198 is a wasteful number, since it uses less digits than its factorization.

131221198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3859466.

The product of its digits is 864, while the sum is 28.

The square root of 131221198 is about 11455.1821460857. The cubic root of 131221198 is about 508.1610020398.

The spelling of 131221198 in words is "one hundred thirty-one million, two hundred twenty-one thousand, one hundred ninety-eight".