198243161 has 4 divisors (see below), whose sum is σ = 201983652. Its totient is φ = 194502672.

The previous prime is 198243119. The next prime is 198243197. The reversal of 198243161 is 161342891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 182790400 + 15452761 = 13520^2 + 3931^2 .

It is a cyclic number.

It is not a de Polignac number, because 198243161 - 2¹⁰ = 198242137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198243761) 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, 1870166 + ... + 1870271.

It is an arithmetic number, because the mean of its divisors is an integer number (50495913).

Almost surely, 2^198243161 is an apocalyptic number.

It is an amenable number.

198243161 is a deficient number, since it is larger than the sum of its proper divisors (3740491).

198243161 is an equidigital number, since it uses as much as digits as its factorization.

198243161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3740490.

The product of its digits is 10368, while the sum is 35.

The square root of 198243161 is about 14079.8849782234. The cubic root of 198243161 is about 583.0861663795.

The spelling of 198243161 in words is "one hundred ninety-eight million, two hundred forty-three thousand, one hundred sixty-one".