198170971 has 2 divisors, whose sum is σ = 198170972. Its totient is φ = 198170970.

The previous prime is 198170953. The next prime is 198171019. The reversal of 198170971 is 179071891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198170971 - 2⁹ = 198170459 is a prime.

It is not a weakly prime, because it can be changed into another prime (198176971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99085485 + 99085486.

It is an arithmetic number, because the mean of its divisors is an integer number (99085486).

Almost surely, 2^198170971 is an apocalyptic number.

198170971 is a deficient number, since it is larger than the sum of its proper divisors (1).

198170971 is an equidigital number, since it uses as much as digits as its factorization.

198170971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 43.

The square root of 198170971 is about 14077.3211585159. The cubic root of 198170971 is about 583.0153810864.

The spelling of 198170971 in words is "one hundred ninety-eight million, one hundred seventy thousand, nine hundred seventy-one".