131978198 has 8 divisors (see below), whose sum is σ = 215964360. Its totient is φ = 59990080.

The previous prime is 131978183. The next prime is 131978207. The reversal of 131978198 is 891879131.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2999483 + ... + 2999526.

It is an arithmetic number, because the mean of its divisors is an integer number (26995545).

Almost surely, 2^131978198 is an apocalyptic number.

131978198 is a deficient number, since it is larger than the sum of its proper divisors (83986162).

131978198 is a wasteful number, since it uses less digits than its factorization.

131978198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5999022.

The product of its digits is 108864, while the sum is 47.

The square root of 131978198 is about 11488.1764436311. The cubic root of 131978198 is about 509.1363030970.

The spelling of 131978198 in words is "one hundred thirty-one million, nine hundred seventy-eight thousand, one hundred ninety-eight".