998171899 has 2 divisors, whose sum is σ = 998171900. Its totient is φ = 998171898.

The previous prime is 998171869. The next prime is 998171957.

998171899 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 998171899 - 2¹³ = 998163707 is a prime.

It is not a weakly prime, because it can be changed into another prime (998171849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499085949 + 499085950.

It is an arithmetic number, because the mean of its divisors is an integer number (499085950).

Almost surely, 2^998171899 is an apocalyptic number.

998171899 is a deficient number, since it is larger than the sum of its proper divisors (1).

998171899 is an equidigital number, since it uses as much as digits as its factorization.

998171899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 61.

The square root of 998171899 is about 31593.8585646008. The cubic root of 998171899 is about 999.3902612943.

The spelling of 998171899 in words is "nine hundred ninety-eight million, one hundred seventy-one thousand, eight hundred ninety-nine".