198809841 has 4 divisors (see below), whose sum is σ = 265079792. Its totient is φ = 132539892.

The previous prime is 198809777. The next prime is 198809867. The reversal of 198809841 is 148908891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 148908891 = 3 ⋅49636297.

It is not a de Polignac number, because 198809841 - 2⁶ = 198809777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198809341) 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, 33134971 + ... + 33134976.

It is an arithmetic number, because the mean of its divisors is an integer number (66269948).

Almost surely, 2^198809841 is an apocalyptic number.

It is an amenable number.

198809841 is a deficient number, since it is larger than the sum of its proper divisors (66269951).

198809841 is an equidigital number, since it uses as much as digits as its factorization.

198809841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66269950.

The product of its (nonzero) digits is 165888, while the sum is 48.

The square root of 198809841 is about 14099.9943617010. The cubic root of 198809841 is about 583.6412236582.

The spelling of 198809841 in words is "one hundred ninety-eight million, eight hundred nine thousand, eight hundred forty-one".