198434881 has 4 divisors (see below), whose sum is σ = 198967252. Its totient is φ = 197902512.

The previous prime is 198434861. The next prime is 198434903. The reversal of 198434881 is 188434891.

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 139452481 + 58982400 = 11809^2 + 7680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198434881 is a prime.

It is a super-2 number, since 2×198434881² = 78752803994968322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198434861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265626 + ... + 266371.

It is an arithmetic number, because the mean of its divisors is an integer number (49741813).

Almost surely, 2^198434881 is an apocalyptic number.

It is an amenable number.

198434881 is a deficient number, since it is larger than the sum of its proper divisors (532371).

198434881 is an equidigital number, since it uses as much as digits as its factorization.

198434881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532370.

The product of its digits is 221184, while the sum is 46.

The square root of 198434881 is about 14086.6916272062. The cubic root of 198434881 is about 583.2740724198.

The spelling of 198434881 in words is "one hundred ninety-eight million, four hundred thirty-four thousand, eight hundred eighty-one".