198131 has 4 divisors (see below), whose sum is σ = 199200. Its totient is φ = 197064.

The previous prime is 198127. The next prime is 198139. The reversal of 198131 is 131891.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 198131 - 2² = 198127 is a prime.

It is a super-3 number, since 3×198131³ = 23333428103646273, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198097 and 198106.

It is not an unprimeable number, because it can be changed into a prime (198139) 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, 176 + ... + 653.

It is an arithmetic number, because the mean of its divisors is an integer number (49800).

2¹⁹⁸¹³¹ is an apocalyptic number.

198131 is a deficient number, since it is larger than the sum of its proper divisors (1069).

198131 is an equidigital number, since it uses as much as digits as its factorization.

198131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068.

The product of its digits is 216, while the sum is 23.

The square root of 198131 is about 445.1190851896. The cubic root of 198131 is about 58.2976180466.

The spelling of 198131 in words is "one hundred ninety-eight thousand, one hundred thirty-one".