816871 has 12 divisors (see below), whose sum is σ = 924616. Its totient is φ = 720720.

The previous prime is 816869. The next prime is 816883. The reversal of 816871 is 178618.

816871 is nontrivially palindromic in base 3.

It is not a de Polignac number, because 816871 - 2¹ = 816869 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5125 + ... + 5281.

2⁸¹⁶⁸⁷¹ is an apocalyptic number.

816871 is a deficient number, since it is larger than the sum of its proper divisors (107745).

816871 is a wasteful number, since it uses less digits than its factorization.

816871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 211 counting only the distinct ones).

The product of its digits is 2688, while the sum is 31.

The square root of 816871 is about 903.8091612724. The cubic root of 816871 is about 93.4798110966.

The spelling of 816871 in words is "eight hundred sixteen thousand, eight hundred seventy-one".