998559841 has 2 divisors, whose sum is σ = 998559842. Its totient is φ = 998559840.

The previous prime is 998559761. The next prime is 998559853. The reversal of 998559841 is 148955899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 960070225 + 38489616 = 30985^2 + 6204^2 .

It is a cyclic number.

It is not a de Polignac number, because 998559841 - 2⁷ = 998559713 is a prime.

It is not a weakly prime, because it can be changed into another prime (998553841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499279920 + 499279921.

It is an arithmetic number, because the mean of its divisors is an integer number (499279921).

Almost surely, 2^998559841 is an apocalyptic number.

It is an amenable number.

998559841 is a deficient number, since it is larger than the sum of its proper divisors (1).

998559841 is an equidigital number, since it uses as much as digits as its factorization.

998559841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4665600, while the sum is 58.

The square root of 998559841 is about 31599.9974841771. The cubic root of 998559841 is about 999.5197163646.

The spelling of 998559841 in words is "nine hundred ninety-eight million, five hundred fifty-nine thousand, eight hundred forty-one".