871491 has 4 divisors (see below), whose sum is σ = 1161992. Its totient is φ = 580992.

The previous prime is 871477. The next prime is 871513. The reversal of 871491 is 194178.

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

It is not a de Polignac number, because 871491 - 2⁵ = 871459 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 13 and base 15.

It is not an unprimeable number, because it can be changed into a prime (870491) 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, 145246 + ... + 145251.

It is an arithmetic number, because the mean of its divisors is an integer number (290498).

2⁸⁷¹⁴⁹¹ is an apocalyptic number.

871491 is a deficient number, since it is larger than the sum of its proper divisors (290501).

871491 is a wasteful number, since it uses less digits than its factorization.

871491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290500.

The product of its digits is 2016, while the sum is 30.

The square root of 871491 is about 933.5368230552. The cubic root of 871491 is about 95.5185311663.

The spelling of 871491 in words is "eight hundred seventy-one thousand, four hundred ninety-one".