71047 has 4 divisors (see below), whose sum is σ = 74160. Its totient is φ = 67936.

The previous prime is 71039. The next prime is 71059. The reversal of 71047 is 74017.

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 71047 - 2³ = 71039 is a prime.

It is an Ulam number.

It is a Duffinian number.

71047 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71147) 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, 1522 + ... + 1567.

It is an arithmetic number, because the mean of its divisors is an integer number (18540).

2⁷¹⁰⁴⁷ is an apocalyptic number.

71047 is a deficient number, since it is larger than the sum of its proper divisors (3113).

71047 is a wasteful number, since it uses less digits than its factorization.

71047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3112.

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 71047 is about 266.5464312273. The cubic root of 71047 is about 41.4173124945.

It can be divided in two parts, 710 and 47, that added together give a palindrome (757).

The spelling of 71047 in words is "seventy-one thousand, forty-seven", and thus it is an iban number.