198890297 has 2 divisors, whose sum is σ = 198890298. Its totient is φ = 198890296.

The previous prime is 198890249. The next prime is 198890353. The reversal of 198890297 is 792098891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169416256 + 29474041 = 13016^2 + 5429^2 .

It is an emirp because it is prime and its reverse (792098891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198890297 - 2²² = 194695993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198890597) 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, 99445148 + 99445149.

It is an arithmetic number, because the mean of its divisors is an integer number (99445149).

Almost surely, 2^198890297 is an apocalyptic number.

It is an amenable number.

198890297 is a deficient number, since it is larger than the sum of its proper divisors (1).

198890297 is an equidigital number, since it uses as much as digits as its factorization.

198890297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 53.

The square root of 198890297 is about 14102.8471238966. The cubic root of 198890297 is about 583.7199439488.

The spelling of 198890297 in words is "one hundred ninety-eight million, eight hundred ninety thousand, two hundred ninety-seven".