198344621 has 2 divisors, whose sum is σ = 198344622. Its totient is φ = 198344620.

The previous prime is 198344609. The next prime is 198344639. The reversal of 198344621 is 126443891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163072900 + 35271721 = 12770^2 + 5939^2 .

It is a cyclic number.

It is not a de Polignac number, because 198344621 - 2¹⁰ = 198343597 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198344651) 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 as a sum of consecutive naturals, namely, 99172310 + 99172311.

It is an arithmetic number, because the mean of its divisors is an integer number (99172311).

Almost surely, 2^198344621 is an apocalyptic number.

It is an amenable number.

198344621 is a deficient number, since it is larger than the sum of its proper divisors (1).

198344621 is an equidigital number, since it uses as much as digits as its factorization.

198344621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 38.

The square root of 198344621 is about 14083.4875297279. The cubic root of 198344621 is about 583.1856230811.

The spelling of 198344621 in words is "one hundred ninety-eight million, three hundred forty-four thousand, six hundred twenty-one".