998038081 has 4 divisors (see below), whose sum is σ = 998101552. Its totient is φ = 997974612.

The previous prime is 998038043. The next prime is 998038147. The reversal of 998038081 is 180830899.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 180830899 = 23 ⋅7862213.

It is a cyclic number.

It is not a de Polignac number, because 998038081 - 2¹⁹ = 997513793 is a prime.

It is a super-2 number, since 2×998038081² = 1992160022252325122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998038001) 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 in 3 ways as a sum of consecutive naturals, for example, 11350 + ... + 46096.

It is an arithmetic number, because the mean of its divisors is an integer number (249525388).

Almost surely, 2^998038081 is an apocalyptic number.

998038081 is the 18240-th hex number.

It is an amenable number.

998038081 is a deficient number, since it is larger than the sum of its proper divisors (63471).

998038081 is a wasteful number, since it uses less digits than its factorization.

998038081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63470.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 998038081 is about 31591.7407086093. The cubic root of 998038081 is about 999.3455988526.

The spelling of 998038081 in words is "nine hundred ninety-eight million, thirty-eight thousand, eighty-one".