71205671 has 4 divisors (see below), whose sum is σ = 71271912. Its totient is φ = 71139432.

The previous prime is 71205653. The next prime is 71205679. The reversal of 71205671 is 17650217.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71205671 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 (71205679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31481 + ... + 33666.

It is an arithmetic number, because the mean of its divisors is an integer number (17817978).

Almost surely, 2^71205671 is an apocalyptic number.

71205671 is a deficient number, since it is larger than the sum of its proper divisors (66241).

71205671 is a wasteful number, since it uses less digits than its factorization.

71205671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66240.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 71205671 is about 8438.3452761783. The cubic root of 71205671 is about 414.4812233488.

Adding to 71205671 its reverse (17650217), we get a palindrome (88855888).

The spelling of 71205671 in words is "seventy-one million, two hundred five thousand, six hundred seventy-one".