998111 has 2 divisors, whose sum is σ = 998112. Its totient is φ = 998110.

The previous prime is 998083. The next prime is 998117. The reversal of 998111 is 111899.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998111 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499055 + 499056.

It is an arithmetic number, because the mean of its divisors is an integer number (499056).

2⁹⁹⁸¹¹¹ is an apocalyptic number.

998111 is a deficient number, since it is larger than the sum of its proper divisors (1).

998111 is an equidigital number, since it uses as much as digits as its factorization.

998111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 29.

The square root of 998111 is about 999.0550535381. The cubic root of 998111 is about 99.9369936437.

The spelling of 998111 in words is "nine hundred ninety-eight thousand, one hundred eleven".