998173549 has 2 divisors, whose sum is σ = 998173550. Its totient is φ = 998173548.

The previous prime is 998173507. The next prime is 998173567. The reversal of 998173549 is 945371899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 811851049 + 186322500 = 28493^2 + 13650^2 .

It is a cyclic number.

It is not a de Polignac number, because 998173549 - 2²¹ = 996076397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 998173549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998170549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499086774 + 499086775.

It is an arithmetic number, because the mean of its divisors is an integer number (499086775).

Almost surely, 2^998173549 is an apocalyptic number.

It is an amenable number.

998173549 is a deficient number, since it is larger than the sum of its proper divisors (1).

998173549 is an equidigital number, since it uses as much as digits as its factorization.

998173549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 55.

The square root of 998173549 is about 31593.8846772599. The cubic root of 998173549 is about 999.3908119653.

The spelling of 998173549 in words is "nine hundred ninety-eight million, one hundred seventy-three thousand, five hundred forty-nine".