998818871 has 2 divisors, whose sum is σ = 998818872. Its totient is φ = 998818870.

The previous prime is 998818831. The next prime is 998818897. The reversal of 998818871 is 178818899.

It is a happy number.

998818871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998818871 - 2²² = 994624567 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 998818871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998818831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499409435 + 499409436.

It is an arithmetic number, because the mean of its divisors is an integer number (499409436).

Almost surely, 2^998818871 is an apocalyptic number.

998818871 is a deficient number, since it is larger than the sum of its proper divisors (1).

998818871 is an equidigital number, since it uses as much as digits as its factorization.

998818871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2322432, while the sum is 59.

The square root of 998818871 is about 31604.0957946909. The cubic root of 998818871 is about 999.6061352242.

The spelling of 998818871 in words is "nine hundred ninety-eight million, eight hundred eighteen thousand, eight hundred seventy-one".