171889 has 2 divisors, whose sum is σ = 171890. Its totient is φ = 171888.

The previous prime is 171881. The next prime is 171917. The reversal of 171889 is 988171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153664 + 18225 = 392^2 + 135^2 .

It is a cyclic number.

It is not a de Polignac number, because 171889 - 2³ = 171881 is a prime.

It is not a weakly prime, because it can be changed into another prime (171881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85944 + 85945.

It is an arithmetic number, because the mean of its divisors is an integer number (85945).

2¹⁷¹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

171889 is a deficient number, since it is larger than the sum of its proper divisors (1).

171889 is an equidigital number, since it uses as much as digits as its factorization.

171889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 34.

The square root of 171889 is about 414.5949830859. The cubic root of 171889 is about 55.6010118340.

The spelling of 171889 in words is "one hundred seventy-one thousand, eight hundred eighty-nine".