998111899 has 2 divisors, whose sum is σ = 998111900. Its totient is φ = 998111898.

The previous prime is 998111897. The next prime is 998111927.

998111899 is nontrivially palindromic in base 10 and base 11.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 998111899 - 2¹ = 998111897 is a prime.

Together with 998111897, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (998111897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499055949 + 499055950.

It is an arithmetic number, because the mean of its divisors is an integer number (499055950).

Almost surely, 2^998111899 is an apocalyptic number.

998111899 is a deficient number, since it is larger than the sum of its proper divisors (1).

998111899 is an equidigital number, since it uses as much as digits as its factorization.

998111899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 55.

The square root of 998111899 is about 31592.9089986978. The cubic root of 998111899 is about 999.3702364812.

The spelling of 998111899 in words is "nine hundred ninety-eight million, one hundred eleven thousand, eight hundred ninety-nine".