998824891 has 2 divisors, whose sum is σ = 998824892. Its totient is φ = 998824890.

The previous prime is 998824859. The next prime is 998824907. The reversal of 998824891 is 198428899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998824891 - 2⁵ = 998824859 is a prime.

It is not a weakly prime, because it can be changed into another prime (998824831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499412445 + 499412446.

It is an arithmetic number, because the mean of its divisors is an integer number (499412446).

Almost surely, 2^998824891 is an apocalyptic number.

998824891 is a deficient number, since it is larger than the sum of its proper divisors (1).

998824891 is an equidigital number, since it uses as much as digits as its factorization.

998824891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2985984, while the sum is 58.

The square root of 998824891 is about 31604.1910353674. The cubic root of 998824891 is about 999.6081434685.

The spelling of 998824891 in words is "nine hundred ninety-eight million, eight hundred twenty-four thousand, eight hundred ninety-one".