198818897 has 2 divisors, whose sum is σ = 198818898. Its totient is φ = 198818896.

The previous prime is 198818887. The next prime is 198818909. The reversal of 198818897 is 798818891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165997456 + 32821441 = 12884^2 + 5729^2 .

It is a cyclic number.

It is not a de Polignac number, because 198818897 - 2⁶ = 198818833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198818827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99409448 + 99409449.

It is an arithmetic number, because the mean of its divisors is an integer number (99409449).

Almost surely, 2^198818897 is an apocalyptic number.

It is an amenable number.

198818897 is a deficient number, since it is larger than the sum of its proper divisors (1).

198818897 is an equidigital number, since it uses as much as digits as its factorization.

198818897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 59.

The square root of 198818897 is about 14100.3154929243. The cubic root of 198818897 is about 583.6500853501.

The spelling of 198818897 in words is "one hundred ninety-eight million, eight hundred eighteen thousand, eight hundred ninety-seven".