871391 has 4 divisors (see below), whose sum is σ = 877800. Its totient is φ = 864984.

The previous prime is 871349. The next prime is 871393. The reversal of 871391 is 193178.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193178 = 2 ⋅96589.

It is a cyclic number.

It is not a de Polignac number, because 871391 - 2¹⁰ = 870367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 871391.

It is not an unprimeable number, because it can be changed into a prime (871393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2996 + ... + 3273.

It is an arithmetic number, because the mean of its divisors is an integer number (219450).

2⁸⁷¹³⁹¹ is an apocalyptic number.

871391 is a deficient number, since it is larger than the sum of its proper divisors (6409).

871391 is a wasteful number, since it uses less digits than its factorization.

871391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6408.

The product of its digits is 1512, while the sum is 29.

The square root of 871391 is about 933.4832617675. The cubic root of 871391 is about 95.5148775740.

The spelling of 871391 in words is "eight hundred seventy-one thousand, three hundred ninety-one".