871591 has 4 divisors (see below), whose sum is σ = 996112. Its totient is φ = 747072.

The previous prime is 871589. The next prime is 871597. The reversal of 871591 is 195178.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 871591 - 2¹ = 871589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871597) 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 in 3 ways as a sum of consecutive naturals, for example, 62250 + ... + 62263.

It is an arithmetic number, because the mean of its divisors is an integer number (249028).

2⁸⁷¹⁵⁹¹ is an apocalyptic number.

871591 is a deficient number, since it is larger than the sum of its proper divisors (124521).

871591 is a wasteful number, since it uses less digits than its factorization.

871591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124520.

The product of its digits is 2520, while the sum is 31.

The square root of 871591 is about 933.5903812701. The cubic root of 871591 is about 95.5221844791.

The spelling of 871591 in words is "eight hundred seventy-one thousand, five hundred ninety-one".