71713645231 has 4 divisors (see below), whose sum is σ = 71715139912. Its totient is φ = 71712150552.

The previous prime is 71713645217. The next prime is 71713645243. The reversal of 71713645231 is 13254631717.

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-71713645231 is a prime.

It is a super-2 number, since 2×71713645231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71713445231) 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, 672900 + ... + 772153.

It is an arithmetic number, because the mean of its divisors is an integer number (17928784978).

Almost surely, 2^71713645231 is an apocalyptic number.

71713645231 is a deficient number, since it is larger than the sum of its proper divisors (1494681).

71713645231 is a wasteful number, since it uses less digits than its factorization.

71713645231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494680.

The product of its digits is 105840, while the sum is 40.

The spelling of 71713645231 in words is "seventy-one billion, seven hundred thirteen million, six hundred forty-five thousand, two hundred thirty-one".