198921241 has 4 divisors (see below), whose sum is σ = 209390800. Its totient is φ = 188451684.

The previous prime is 198921223. The next prime is 198921251. The reversal of 198921241 is 142129891.

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 198921241 - 2¹³ = 198913049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198921241.

It is not an unprimeable number, because it can be changed into a prime (198921251) 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, 5234751 + ... + 5234788.

It is an arithmetic number, because the mean of its divisors is an integer number (52347700).

Almost surely, 2^198921241 is an apocalyptic number.

It is an amenable number.

198921241 is a deficient number, since it is larger than the sum of its proper divisors (10469559).

198921241 is a wasteful number, since it uses less digits than its factorization.

198921241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10469558.

The product of its digits is 10368, while the sum is 37.

The square root of 198921241 is about 14103.9441646654. The cubic root of 198921241 is about 583.7502147288.

The spelling of 198921241 in words is "one hundred ninety-eight million, nine hundred twenty-one thousand, two hundred forty-one".