998808331 has 4 divisors (see below), whose sum is σ = 999223992. Its totient is φ = 998392672.

The previous prime is 998808319. The next prime is 998808337. The reversal of 998808331 is 133808899.

998808331 = T₂₅₈₀₃ + T₂₅₈₀₄ + T₂₅₈₀₅.

998808331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133808899 = 7 ⋅19115557.

It is a cyclic number.

It is not a de Polignac number, because 998808331 - 2⁷ = 998808203 is a prime.

It is a super-2 number, since 2×998808331² = 1995236164150011122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998808337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204205 + ... + 209038.

It is an arithmetic number, because the mean of its divisors is an integer number (249805998).

Almost surely, 2^998808331 is an apocalyptic number.

998808331 is the 25805-th centered triangular number.

998808331 is a deficient number, since it is larger than the sum of its proper divisors (415661).

998808331 is a wasteful number, since it uses less digits than its factorization.

998808331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415660.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 998808331 is about 31603.9290437123. The cubic root of 998808331 is about 999.6026191093.

The spelling of 998808331 in words is "nine hundred ninety-eight million, eight hundred eight thousand, three hundred thirty-one".