198179221 has 4 divisors (see below), whose sum is σ = 198218944. Its totient is φ = 198139500.

The previous prime is 198179203. The next prime is 198179231. The reversal of 198179221 is 122971891.

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.

It is a cyclic number.

It is not a de Polignac number, because 198179221 - 2⁹ = 198178709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198179231) 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, 11085 + ... + 22786.

It is an arithmetic number, because the mean of its divisors is an integer number (49554736).

Almost surely, 2^198179221 is an apocalyptic number.

It is an amenable number.

198179221 is a deficient number, since it is larger than the sum of its proper divisors (39723).

198179221 is an equidigital number, since it uses as much as digits as its factorization.

198179221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39722.

The product of its digits is 18144, while the sum is 40.

The square root of 198179221 is about 14077.6141799667. The cubic root of 198179221 is about 583.0234714240.

The spelling of 198179221 in words is "one hundred ninety-eight million, one hundred seventy-nine thousand, two hundred twenty-one".