198238861 has 4 divisors (see below), whose sum is σ = 200201724. Its totient is φ = 196276000.

The previous prime is 198238849. The next prime is 198238871. The reversal of 198238861 is 168832891.

198238861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 168832891 = 251 ⋅672641.

It can be written as a sum of positive squares in 2 ways, for example, as 174081636 + 24157225 = 13194^2 + 4915^2 .

It is a cyclic number.

It is not a de Polignac number, because 198238861 - 2²¹ = 196141709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198238841) 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, 981280 + ... + 981481.

It is an arithmetic number, because the mean of its divisors is an integer number (50050431).

Almost surely, 2^198238861 is an apocalyptic number.

It is an amenable number.

198238861 is a deficient number, since it is larger than the sum of its proper divisors (1962863).

198238861 is a wasteful number, since it uses less digits than its factorization.

198238861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1962862.

The product of its digits is 165888, while the sum is 46.

The square root of 198238861 is about 14079.7322772843. The cubic root of 198238861 is about 583.0819505322.

The spelling of 198238861 in words is "one hundred ninety-eight million, two hundred thirty-eight thousand, eight hundred sixty-one".