998812813 has 2 divisors, whose sum is σ = 998812814. Its totient is φ = 998812812.

The previous prime is 998812811. The next prime is 998812831. The reversal of 998812813 is 318218899.

998812813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (998812831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 630863689 + 367949124 = 25117^2 + 19182^2 .

It is a cyclic number.

It is not a de Polignac number, because 998812813 - 2¹ = 998812811 is a prime.

Together with 998812811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998812811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499406406 + 499406407.

It is an arithmetic number, because the mean of its divisors is an integer number (499406407).

Almost surely, 2^998812813 is an apocalyptic number.

It is an amenable number.

998812813 is a deficient number, since it is larger than the sum of its proper divisors (1).

998812813 is an equidigital number, since it uses as much as digits as its factorization.

998812813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 49.

The square root of 998812813 is about 31603.9999525377. Note that the first 4 decimals coincide. The cubic root of 998812813 is about 999.6041142952.

It can be divided in two parts, 9988 and 12813, that added together give a square (22801 = 151²).

The spelling of 998812813 in words is "nine hundred ninety-eight million, eight hundred twelve thousand, eight hundred thirteen".