998743831 has 2 divisors, whose sum is σ = 998743832. Its totient is φ = 998743830.

The previous prime is 998743817. The next prime is 998743841. The reversal of 998743831 is 138347899.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998743831 is a prime.

It is a super-2 number, since 2×998743831² = 1994978479921113122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998743841) 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, 499371915 + 499371916.

It is an arithmetic number, because the mean of its divisors is an integer number (499371916).

Almost surely, 2^998743831 is an apocalyptic number.

998743831 is a deficient number, since it is larger than the sum of its proper divisors (1).

998743831 is an equidigital number, since it uses as much as digits as its factorization.

998743831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 52.

The square root of 998743831 is about 31602.9085844958. The cubic root of 998743831 is about 999.5811015486.

The spelling of 998743831 in words is "nine hundred ninety-eight million, seven hundred forty-three thousand, eight hundred thirty-one".