198380321 has 2 divisors, whose sum is σ = 198380322. Its totient is φ = 198380320.

The previous prime is 198380269. The next prime is 198380341. The reversal of 198380321 is 123083891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143041600 + 55338721 = 11960^2 + 7439^2 .

It is a cyclic number.

It is not a de Polignac number, because 198380321 - 2²² = 194186017 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_10994156 and since 198380321 and 10994156 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (198380341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99190160 + 99190161.

It is an arithmetic number, because the mean of its divisors is an integer number (99190161).

Almost surely, 2^198380321 is an apocalyptic number.

It is an amenable number.

198380321 is a deficient number, since it is larger than the sum of its proper divisors (1).

198380321 is an equidigital number, since it uses as much as digits as its factorization.

198380321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 198380321 is about 14084.7549144456. The cubic root of 198380321 is about 583.2206101281.

The spelling of 198380321 in words is "one hundred ninety-eight million, three hundred eighty thousand, three hundred twenty-one".