998171849 has 2 divisors, whose sum is σ = 998171850. Its totient is φ = 998171848.

The previous prime is 998171833. The next prime is 998171869. The reversal of 998171849 is 948171899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 945870025 + 52301824 = 30755^2 + 7232^2 .

It is a cyclic number.

It is not a de Polignac number, because 998171849 - 2⁴ = 998171833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 998171794 and 998171803.

It is not a weakly prime, because it can be changed into another prime (998171869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499085924 + 499085925.

It is an arithmetic number, because the mean of its divisors is an integer number (499085925).

Almost surely, 2^998171849 is an apocalyptic number.

It is an amenable number.

998171849 is a deficient number, since it is larger than the sum of its proper divisors (1).

998171849 is an equidigital number, since it uses as much as digits as its factorization.

998171849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 56.

The square root of 998171849 is about 31593.8577733078. The cubic root of 998171849 is about 999.3902446073.

The spelling of 998171849 in words is "nine hundred ninety-eight million, one hundred seventy-one thousand, eight hundred forty-nine".