998866199 has 2 divisors, whose sum is σ = 998866200. Its totient is φ = 998866198.

The previous prime is 998866177. The next prime is 998866201. The reversal of 998866199 is 991668899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998866199 - 2⁸ = 998865943 is a prime.

Together with 998866201, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998866139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499433099 + 499433100.

It is an arithmetic number, because the mean of its divisors is an integer number (499433100).

Almost surely, 2^998866199 is an apocalyptic number.

998866199 is a deficient number, since it is larger than the sum of its proper divisors (1).

998866199 is an equidigital number, since it uses as much as digits as its factorization.

998866199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15116544, while the sum is 65.

The square root of 998866199 is about 31604.8445495307. The cubic root of 998866199 is about 999.6219234094.

The spelling of 998866199 in words is "nine hundred ninety-eight million, eight hundred sixty-six thousand, one hundred ninety-nine".