999198289 has 2 divisors, whose sum is σ = 999198290. Its totient is φ = 999198288.

The previous prime is 999198203. The next prime is 999198367. The reversal of 999198289 is 982891999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 948147264 + 51051025 = 30792^2 + 7145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999198289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999198289.

It is not a weakly prime, because it can be changed into another prime (999198089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499599144 + 499599145.

It is an arithmetic number, because the mean of its divisors is an integer number (499599145).

Almost surely, 2^999198289 is an apocalyptic number.

It is an amenable number.

999198289 is a deficient number, since it is larger than the sum of its proper divisors (1).

999198289 is an equidigital number, since it uses as much as digits as its factorization.

999198289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7558272, while the sum is 64.

The square root of 999198289 is about 31610.0978960838. The cubic root of 999198289 is about 999.7326915526.

The spelling of 999198289 in words is "nine hundred ninety-nine million, one hundred ninety-eight thousand, two hundred eighty-nine".