198331 has 8 divisors (see below), whose sum is σ = 234720. Its totient is φ = 163968.

The previous prime is 198323. The next prime is 198337. The reversal of 198331 is 133891.

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

It is not a de Polignac number, because 198331 - 2³ = 198323 is a prime.

It is a super-2 number, since 2×198331² = 78670371122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198296 and 198305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198337) 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, 286 + ... + 691.

It is an arithmetic number, because the mean of its divisors is an integer number (29340).

2¹⁹⁸³³¹ is an apocalyptic number.

198331 is a deficient number, since it is larger than the sum of its proper divisors (36389).

198331 is an equidigital number, since it uses as much as digits as its factorization.

198331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013.

The product of its digits is 648, while the sum is 25.

The square root of 198331 is about 445.3436875044. The cubic root of 198331 is about 58.3172272995.

It can be divided in two parts, 198 and 331, that added together give a square (529 = 23²).

The spelling of 198331 in words is "one hundred ninety-eight thousand, three hundred thirty-one".