998213831 has 2 divisors, whose sum is σ = 998213832. Its totient is φ = 998213830.

The previous prime is 998213809. The next prime is 998213833. The reversal of 998213831 is 138312899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998213831 - 2⁶ = 998213767 is a prime.

It is a super-2 number, since 2×998213831² = 1992861704799393122, which contains 22 as substring.

Together with 998213833, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998213833) 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, 499106915 + 499106916.

It is an arithmetic number, because the mean of its divisors is an integer number (499106916).

Almost surely, 2^998213831 is an apocalyptic number.

998213831 is a deficient number, since it is larger than the sum of its proper divisors (1).

998213831 is an equidigital number, since it uses as much as digits as its factorization.

998213831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The square root of 998213831 is about 31594.5221676163. The cubic root of 998213831 is about 999.4042554923.

The spelling of 998213831 in words is "nine hundred ninety-eight million, two hundred thirteen thousand, eight hundred thirty-one".