198949891 has 4 divisors (see below), whose sum is σ = 227371312. Its totient is φ = 170528472.

The previous prime is 198949873. The next prime is 198949897.

198949891 is nontrivially palindromic in base 10.

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 198949891 - 2¹⁵ = 198917123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198949897) 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, 14210700 + ... + 14210713.

It is an arithmetic number, because the mean of its divisors is an integer number (56842828).

Almost surely, 2^198949891 is an apocalyptic number.

198949891 is a deficient number, since it is larger than the sum of its proper divisors (28421421).

198949891 is an equidigital number, since it uses as much as digits as its factorization.

198949891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28421420.

The product of its digits is 1679616, while the sum is 58.

The square root of 198949891 is about 14104.9598014316. The cubic root of 198949891 is about 583.7782386185.

The spelling of 198949891 in words is "one hundred ninety-eight million, nine hundred forty-nine thousand, eight hundred ninety-one".