198119231 has 4 divisors (see below), whose sum is σ = 198427992. Its totient is φ = 197810472.

The previous prime is 198119219. The next prime is 198119237. The reversal of 198119231 is 132911891.

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

It is a cyclic number.

It is not a de Polignac number, because 198119231 - 2¹⁸ = 197857087 is a prime.

It is a super-2 number, since 2×198119231² = 78502459384062722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198119191 and 198119200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198119237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153416 + ... + 154701.

It is an arithmetic number, because the mean of its divisors is an integer number (49606998).

Almost surely, 2^198119231 is an apocalyptic number.

198119231 is a deficient number, since it is larger than the sum of its proper divisors (308761).

198119231 is an equidigital number, since it uses as much as digits as its factorization.

198119231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308760.

The product of its digits is 3888, while the sum is 35.

The square root of 198119231 is about 14075.4833309553. The cubic root of 198119231 is about 582.9646372913.

It can be divided in two parts, 1981 and 19231, that added together give a palindrome (21212).

The spelling of 198119231 in words is "one hundred ninety-eight million, one hundred nineteen thousand, two hundred thirty-one".