198821243 has 2 divisors, whose sum is σ = 198821244. Its totient is φ = 198821242.

The previous prime is 198821237. The next prime is 198821257. The reversal of 198821243 is 342128891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198821243 - 2¹⁶ = 198755707 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198821197 and 198821206.

It is not a weakly prime, because it can be changed into another prime (198821213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99410621 + 99410622.

It is an arithmetic number, because the mean of its divisors is an integer number (99410622).

Almost surely, 2^198821243 is an apocalyptic number.

198821243 is a deficient number, since it is larger than the sum of its proper divisors (1).

198821243 is an equidigital number, since it uses as much as digits as its factorization.

198821243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 198821243 is about 14100.3986823068. The cubic root of 198821243 is about 583.6523809698.

Adding to 198821243 its product of digits (27648), we get a palindrome (198848891).

The spelling of 198821243 in words is "one hundred ninety-eight million, eight hundred twenty-one thousand, two hundred forty-three".