998485217 has 2 divisors, whose sum is σ = 998485218. Its totient is φ = 998485216.

The previous prime is 998485171. The next prime is 998485253. The reversal of 998485217 is 712584899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 538425616 + 460059601 = 23204^2 + 21449^2 .

It is a cyclic number.

It is not a de Polignac number, because 998485217 - 2¹⁴ = 998468833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (998485277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499242608 + 499242609.

It is an arithmetic number, because the mean of its divisors is an integer number (499242609).

Almost surely, 2^998485217 is an apocalyptic number.

It is an amenable number.

998485217 is a deficient number, since it is larger than the sum of its proper divisors (1).

998485217 is an equidigital number, since it uses as much as digits as its factorization.

998485217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 53.

The square root of 998485217 is about 31598.8167025286. The cubic root of 998485217 is about 999.4948171666.

The spelling of 998485217 in words is "nine hundred ninety-eight million, four hundred eighty-five thousand, two hundred seventeen".