998812811 has 2 divisors, whose sum is σ = 998812812. Its totient is φ = 998812810.

The previous prime is 998812799. The next prime is 998812813. The reversal of 998812811 is 118218899.

998812811 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 998812811 - 2²⁶ = 931703947 is a prime.

Together with 998812813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (998812813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499406405 + 499406406.

It is an arithmetic number, because the mean of its divisors is an integer number (499406406).

Almost surely, 2^998812811 is an apocalyptic number.

998812811 is a deficient number, since it is larger than the sum of its proper divisors (1).

998812811 is an equidigital number, since it uses as much as digits as its factorization.

998812811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 47.

The square root of 998812811 is about 31603.9999208961. Note that the first 4 decimals coincide. The cubic root of 998812811 is about 999.6041136280.

The spelling of 998812811 in words is "nine hundred ninety-eight million, eight hundred twelve thousand, eight hundred eleven".