71571 has 4 divisors (see below), whose sum is σ = 95432. Its totient is φ = 47712.

The previous prime is 71569. The next prime is 71593. The reversal of 71571 is 17517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17517 = 3 ⋅5839.

It is not a de Polignac number, because 71571 - 2¹ = 71569 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71551) 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, 11926 + ... + 11931.

It is an arithmetic number, because the mean of its divisors is an integer number (23858).

2⁷¹⁵⁷¹ is an apocalyptic number.

71571 is a deficient number, since it is larger than the sum of its proper divisors (23861).

71571 is a wasteful number, since it uses less digits than its factorization.

71571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23860.

The product of its digits is 245, while the sum is 21.

The square root of 71571 is about 267.5275686728. The cubic root of 71571 is about 41.5188862603.

The spelling of 71571 in words is "seventy-one thousand, five hundred seventy-one".