998831 has 2 divisors, whose sum is σ = 998832.
Its totient is φ = 998830.
The previous prime is 998819. The next prime is 998839. The reversal of 998831 is 138899.
It is a strong prime.
It is an emirp because it is prime and its reverse (138899) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 998831 - 210 = 997807 is a prime.
It is a super-2 number, since 2×9988312 = 1995326733122, which contains 22 as substring.
It is a Sophie Germain prime.
It is a Chen prime.
It is a nialpdrome in base 10.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (998839) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499415 + 499416.
It is an arithmetic number, because the mean of its divisors is an integer number (499416).
2998831 is an apocalyptic number.
998831 is a deficient number, since it is larger than the sum of its proper divisors (1).
998831 is an equidigital number, since it uses as much as digits as its factorization.
998831 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 998831 is about 999.4153290800.
The cubic root of 998831 is about 99.9610181395.
The spelling of 998831 in words is "nine hundred ninety-eight thousand, eight hundred thirty-one".