998331 has 16 divisors (see below), whose sum is σ = 1393920. Its totient is φ = 635040.

The previous prime is 998329. The next prime is 998353. The reversal of 998331 is 133899.

It is not a de Polignac number, because 998331 - 2¹ = 998329 is a prime.

It is a super-2 number, since 2×998331² = 1993329571122, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 998292 and 998301.

It is not an unprimeable number, because it can be changed into a prime (998311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9105 + ... + 9213.

It is an arithmetic number, because the mean of its divisors is an integer number (87120).

2⁹⁹⁸³³¹ is an apocalyptic number.

998331 is a deficient number, since it is larger than the sum of its proper divisors (395589).

998331 is a wasteful number, since it uses less digits than its factorization.

998331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226.

The product of its digits is 5832, while the sum is 33.

The square root of 998331 is about 999.1651515140. The cubic root of 998331 is about 99.9443356873.

Multiplying 998331 by its sum of digits (33), we get a palindrome (32944923).

The spelling of 998331 in words is "nine hundred ninety-eight thousand, three hundred thirty-one".