998812831 has 2 divisors, whose sum is σ = 998812832. Its totient is φ = 998812830.

The previous prime is 998812813. The next prime is 998812847. The reversal of 998812831 is 138218899.

Together with previous prime (998812813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998812831 - 2⁵ = 998812799 is a prime.

It is a super-2 number, since 2×998812831² = 1995254142740469122, which contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499406415 + 499406416.

It is an arithmetic number, because the mean of its divisors is an integer number (499406416).

Almost surely, 2^998812831 is an apocalyptic number.

998812831 is a deficient number, since it is larger than the sum of its proper divisors (1).

998812831 is an equidigital number, since it uses as much as digits as its factorization.

998812831 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 998812831 is about 31604.0002373117. Note that the first 3 decimals coincide. The cubic root of 998812831 is about 999.6041202999.

The spelling of 998812831 in words is "nine hundred ninety-eight million, eight hundred twelve thousand, eight hundred thirty-one".