989969831 has 2 divisors, whose sum is σ = 989969832. Its totient is φ = 989969830.

The previous prime is 989969807. The next prime is 989969861. The reversal of 989969831 is 138969989.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 989969831 - 2⁶ = 989969767 is a prime.

It is a super-2 number, since 2×989969831² = 1960080532580337122, 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 (989969861) 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, 494984915 + 494984916.

It is an arithmetic number, because the mean of its divisors is an integer number (494984916).

Almost surely, 2^989969831 is an apocalyptic number.

989969831 is a deficient number, since it is larger than the sum of its proper divisors (1).

989969831 is an equidigital number, since it uses as much as digits as its factorization.

989969831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7558272, while the sum is 62.

The square root of 989969831 is about 31463.7860245712. The cubic root of 989969831 is about 996.6453693705.

The spelling of 989969831 in words is "nine hundred eighty-nine million, nine hundred sixty-nine thousand, eight hundred thirty-one".