998227817 has 2 divisors, whose sum is σ = 998227818. Its totient is φ = 998227816.

The previous prime is 998227801. The next prime is 998227897. The reversal of 998227817 is 718722899.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 990297961 + 7929856 = 31469^2 + 2816^2 .

It is a cyclic number.

It is not a de Polignac number, because 998227817 - 2⁴ = 998227801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (998227897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499113908 + 499113909.

It is an arithmetic number, because the mean of its divisors is an integer number (499113909).

Almost surely, 2^998227817 is an apocalyptic number.

It is an amenable number.

998227817 is a deficient number, since it is larger than the sum of its proper divisors (1).

998227817 is an equidigital number, since it uses as much as digits as its factorization.

998227817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 53.

The square root of 998227817 is about 31594.7435026778. The cubic root of 998227817 is about 999.4089230302.

The spelling of 998227817 in words is "nine hundred ninety-eight million, two hundred twenty-seven thousand, eight hundred seventeen".