998475817 has 2 divisors, whose sum is σ = 998475818. Its totient is φ = 998475816.

The previous prime is 998475809. The next prime is 998475827. The reversal of 998475817 is 718574899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 993762576 + 4713241 = 31524^2 + 2171^2 .

It is a cyclic number.

It is not a de Polignac number, because 998475817 - 2³ = 998475809 is a prime.

It is not a weakly prime, because it can be changed into another prime (998475827) 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, 499237908 + 499237909.

It is an arithmetic number, because the mean of its divisors is an integer number (499237909).

Almost surely, 2^998475817 is an apocalyptic number.

It is an amenable number.

998475817 is a deficient number, since it is larger than the sum of its proper divisors (1).

998475817 is an equidigital number, since it uses as much as digits as its factorization.

998475817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 58.

The square root of 998475817 is about 31598.6679624316. The cubic root of 998475817 is about 999.4916806552.

The spelling of 998475817 in words is "nine hundred ninety-eight million, four hundred seventy-five thousand, eight hundred seventeen".