989831 has 2 divisors, whose sum is σ = 989832. Its totient is φ = 989830.

The previous prime is 989827. The next prime is 989837. The reversal of 989831 is 138989.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 989831 - 2² = 989827 is a prime.

It is a super-2 number, since 2×989831² = 1959530817122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494915 + 494916.

It is an arithmetic number, because the mean of its divisors is an integer number (494916).

2⁹⁸⁹⁸³¹ is an apocalyptic number.

989831 is a deficient number, since it is larger than the sum of its proper divisors (1).

989831 is an equidigital number, since it uses as much as digits as its factorization.

989831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 38.

The square root of 989831 is about 994.9025077866. The cubic root of 989831 is about 99.6598778139.

The spelling of 989831 in words is "nine hundred eighty-nine thousand, eight hundred thirty-one".