998764831 has 2 divisors, whose sum is σ = 998764832. Its totient is φ = 998764830.

The previous prime is 998764801. The next prime is 998764867. The reversal of 998764831 is 138467899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998764831 - 2⁵ = 998764799 is a prime.

It is a super-2 number, since 2×998764831² = 1995062375284917122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998764801) 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, 499382415 + 499382416.

It is an arithmetic number, because the mean of its divisors is an integer number (499382416).

Almost surely, 2^998764831 is an apocalyptic number.

998764831 is a deficient number, since it is larger than the sum of its proper divisors (1).

998764831 is an equidigital number, since it uses as much as digits as its factorization.

998764831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 55.

The square root of 998764831 is about 31603.2408306490. The cubic root of 998764831 is about 999.5881073678.

The spelling of 998764831 in words is "nine hundred ninety-eight million, seven hundred sixty-four thousand, eight hundred thirty-one".