198904171 has 2 divisors, whose sum is σ = 198904172. Its totient is φ = 198904170.

The previous prime is 198904169. The next prime is 198904183. The reversal of 198904171 is 171409891.

It is a weak prime.

It is an emirp because it is prime and its reverse (171409891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198904171 - 2¹ = 198904169 is a prime.

Together with 198904169, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (198944171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99452085 + 99452086.

It is an arithmetic number, because the mean of its divisors is an integer number (99452086).

Almost surely, 2^198904171 is an apocalyptic number.

198904171 is a deficient number, since it is larger than the sum of its proper divisors (1).

198904171 is an equidigital number, since it uses as much as digits as its factorization.

198904171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 40.

The square root of 198904171 is about 14103.3390018109. The cubic root of 198904171 is about 583.7335164932.

The spelling of 198904171 in words is "one hundred ninety-eight million, nine hundred four thousand, one hundred seventy-one".