198823213 has 2 divisors, whose sum is σ = 198823214. Its totient is φ = 198823212.

The previous prime is 198823189. The next prime is 198823223. The reversal of 198823213 is 312328891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145853929 + 52969284 = 12077^2 + 7278^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198823213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198823223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99411606 + 99411607.

It is an arithmetic number, because the mean of its divisors is an integer number (99411607).

Almost surely, 2^198823213 is an apocalyptic number.

It is an amenable number.

198823213 is a deficient number, since it is larger than the sum of its proper divisors (1).

198823213 is an equidigital number, since it uses as much as digits as its factorization.

198823213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 198823213 is about 14100.4685383146. The cubic root of 198823213 is about 583.6543086501.

The spelling of 198823213 in words is "one hundred ninety-eight million, eight hundred twenty-three thousand, two hundred thirteen".