198113 has 4 divisors (see below), whose sum is σ = 208560. Its totient is φ = 187668.

The previous prime is 198109. The next prime is 198127. The reversal of 198113 is 311891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 311891 = 31 ⋅10061.

It is a cyclic number.

It is not a de Polignac number, because 198113 - 2² = 198109 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198173) 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, 5195 + ... + 5232.

It is an arithmetic number, because the mean of its divisors is an integer number (52140).

2¹⁹⁸¹¹³ is an apocalyptic number.

It is an amenable number.

198113 is a deficient number, since it is larger than the sum of its proper divisors (10447).

198113 is a wasteful number, since it uses less digits than its factorization.

198113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10446.

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

The square root of 198113 is about 445.0988654221. The cubic root of 198113 is about 58.2958525667.

The spelling of 198113 in words is "one hundred ninety-eight thousand, one hundred thirteen".