871 has 4 divisors (see below), whose sum is σ = 952. Its totient is φ = 792.

The previous prime is 863. The next prime is 877. The reversal of 871 is 178.

871 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 178 = 2 ⋅89.

It is a cyclic number.

It is not a de Polignac number, because 871 - 2^{3} = 863 is a prime.

It is the 30-th Hogben number.

It is a Duffinian number.

It is a plaindrome in base 9 and base 16.

It is a nialpdrome in base 10, base 11 and base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (877) 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 in 3 ways as a sum of consecutive naturals, for example, 21 + ... + 46.

It is an arithmetic number, because the mean of its divisors is an integer number (238).

2^{871} is an apocalyptic number.

871 is a deficient number, since it is larger than the sum of its proper divisors (81).

871 is a wasteful number, since it uses less digits than its factorization.

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

The sum of its prime factors is 80.

The product of its digits is 56, while the sum is 16.

The square root of 871 is about 29.5127091267. The cubic root of 871 is about 9.5500589344.

It can be divided in two parts, 87 and 1, that added together give a palindrome (88).

The spelling of 871 in words is "eight hundred seventy-one", and thus it is an aban number.

• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.104 sec. • engine limits •