998939831 has 2 divisors, whose sum is σ = 998939832. Its totient is φ = 998939830.

The previous prime is 998939819. The next prime is 998939849. The reversal of 998939831 is 138939899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998939831 - 2²⁶ = 931830967 is a prime.

It is a super-2 number, since 2×998939831² = 1995761571916617122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998939881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499469915 + 499469916.

It is an arithmetic number, because the mean of its divisors is an integer number (499469916).

Almost surely, 2^998939831 is an apocalyptic number.

998939831 is a deficient number, since it is larger than the sum of its proper divisors (1).

998939831 is an equidigital number, since it uses as much as digits as its factorization.

998939831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3779136, while the sum is 59.

The square root of 998939831 is about 31606.0094127683. The cubic root of 998939831 is about 999.6464853755.

The spelling of 998939831 in words is "nine hundred ninety-eight million, nine hundred thirty-nine thousand, eight hundred thirty-one".