198681 has 8 divisors (see below), whose sum is σ = 302784. Its totient is φ = 113520.

The previous prime is 198673. The next prime is 198689. The reversal of 198681 is 186891.

It is an interprime number because it is at equal distance from previous prime (198673) and next prime (198689).

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

It is not a de Polignac number, because 198681 - 2³ = 198673 is a prime.

It is a super-2 number, since 2×198681² = 78948279522, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 198681.

It is not an unprimeable number, because it can be changed into a prime (198689) 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, 4710 + ... + 4751.

It is an arithmetic number, because the mean of its divisors is an integer number (37848).

2¹⁹⁸⁶⁸¹ is an apocalyptic number.

It is an amenable number.

198681 is a deficient number, since it is larger than the sum of its proper divisors (104103).

198681 is an equidigital number, since it uses as much as digits as its factorization.

198681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9471.

The product of its digits is 3456, while the sum is 33.

The square root of 198681 is about 445.7364692282. The cubic root of 198681 is about 58.3515117948.

The spelling of 198681 in words is "one hundred ninety-eight thousand, six hundred eighty-one".