998108081 has 2 divisors, whose sum is σ = 998108082. Its totient is φ = 998108080.

The previous prime is 998108039. The next prime is 998108099. The reversal of 998108081 is 180801899.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 637108081 + 361000000 = 25241^2 + 19000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998108081 is a prime.

It is a super-2 number, since 2×998108081² = 1992439482715005122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (998108011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499054040 + 499054041.

It is an arithmetic number, because the mean of its divisors is an integer number (499054041).

Almost surely, 2^998108081 is an apocalyptic number.

It is an amenable number.

998108081 is a deficient number, since it is larger than the sum of its proper divisors (1).

998108081 is an equidigital number, since it uses as much as digits as its factorization.

998108081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 44.

The square root of 998108081 is about 31592.8485736883. The cubic root of 998108081 is about 999.3689622084.

The spelling of 998108081 in words is "nine hundred ninety-eight million, one hundred eight thousand, eighty-one".