163871 has 2 divisors, whose sum is σ = 163872. Its totient is φ = 163870.

The previous prime is 163861. The next prime is 163883. The reversal of 163871 is 178361.

163871 is nontrivially palindromic in base 7.

It is a weak prime.

It is an emirp because it is prime and its reverse (178361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163871 - 2¹⁰ = 162847 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 163871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81935 + 81936.

It is an arithmetic number, because the mean of its divisors is an integer number (81936).

2¹⁶³⁸⁷¹ is an apocalyptic number.

163871 is a deficient number, since it is larger than the sum of its proper divisors (1).

163871 is an equidigital number, since it uses as much as digits as its factorization.

163871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 163871 is about 404.8098318964. The cubic root of 163871 is about 54.7226811993.

The spelling of 163871 in words is "one hundred sixty-three thousand, eight hundred seventy-one".