198400171 has 2 divisors, whose sum is σ = 198400172. Its totient is φ = 198400170.

The previous prime is 198400159. The next prime is 198400193. The reversal of 198400171 is 171004891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198400171 - 2¹³ = 198391979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198400871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99200085 + 99200086.

It is an arithmetic number, because the mean of its divisors is an integer number (99200086).

Almost surely, 2^198400171 is an apocalyptic number.

198400171 is a deficient number, since it is larger than the sum of its proper divisors (1).

198400171 is an equidigital number, since it uses as much as digits as its factorization.

198400171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 198400171 is about 14085.4595594180. The cubic root of 198400171 is about 583.2400618945.

The spelling of 198400171 in words is "one hundred ninety-eight million, four hundred thousand, one hundred seventy-one".