871605671 has 4 divisors (see below), whose sum is σ = 872445600. Its totient is φ = 870765744.

The previous prime is 871605649. The next prime is 871605719. The reversal of 871605671 is 176506178.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 176506178 = 2 ⋅88253089.

It is a cyclic number.

It is not a de Polignac number, because 871605671 - 2¹⁰ = 871604647 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 (871605071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418406 + ... + 420483.

It is an arithmetic number, because the mean of its divisors is an integer number (218111400).

Almost surely, 2^871605671 is an apocalyptic number.

871605671 is a deficient number, since it is larger than the sum of its proper divisors (839929).

871605671 is a wasteful number, since it uses less digits than its factorization.

871605671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839928.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 871605671 is about 29522.9685329914. The cubic root of 871605671 is about 955.2272043317.

The spelling of 871605671 in words is "eight hundred seventy-one million, six hundred five thousand, six hundred seventy-one".