198611 has 8 divisors (see below), whose sum is σ = 240480. Its totient is φ = 160128.

The previous prime is 198599. The next prime is 198613. The reversal of 198611 is 116891.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198613) 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, 716 + ... + 953.

It is an arithmetic number, because the mean of its divisors is an integer number (30060).

2¹⁹⁸⁶¹¹ is an apocalyptic number.

198611 is a deficient number, since it is larger than the sum of its proper divisors (41869).

198611 is a wasteful number, since it uses less digits than its factorization.

198611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693.

The product of its digits is 432, while the sum is 26.

The square root of 198611 is about 445.6579405777. The cubic root of 198611 is about 58.3446581187.

The spelling of 198611 in words is "one hundred ninety-eight thousand, six hundred eleven".