998173567 has 2 divisors, whose sum is σ = 998173568. Its totient is φ = 998173566.

The previous prime is 998173549. The next prime is 998173637. The reversal of 998173567 is 765371899.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998173567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998173507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499086783 + 499086784.

It is an arithmetic number, because the mean of its divisors is an integer number (499086784).

Almost surely, 2^998173567 is an apocalyptic number.

998173567 is a deficient number, since it is larger than the sum of its proper divisors (1).

998173567 is an equidigital number, since it uses as much as digits as its factorization.

998173567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2857680, while the sum is 55.

The square root of 998173567 is about 31593.8849621252. The cubic root of 998173567 is about 999.3908179726.

The spelling of 998173567 in words is "nine hundred ninety-eight million, one hundred seventy-three thousand, five hundred sixty-seven".