998170549 has 2 divisors, whose sum is σ = 998170550. Its totient is φ = 998170548.

The previous prime is 998170541. The next prime is 998170559. The reversal of 998170549 is 945071899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 998117649 + 52900 = 31593^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 998170549 - 2³ = 998170541 is a prime.

It is a super-2 number, since 2×998170549² = 1992688889781922802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 998170496 and 998170505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998170541) 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, 499085274 + 499085275.

It is an arithmetic number, because the mean of its divisors is an integer number (499085275).

Almost surely, 2^998170549 is an apocalyptic number.

It is an amenable number.

998170549 is a deficient number, since it is larger than the sum of its proper divisors (1).

998170549 is an equidigital number, since it uses as much as digits as its factorization.

998170549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 998170549 is about 31593.8371996818. The cubic root of 998170549 is about 999.3898107448.

The spelling of 998170549 in words is "nine hundred ninety-eight million, one hundred seventy thousand, five hundred forty-nine".