71320012231 has 12 divisors (see below), whose sum is σ = 80290764568. Its totient is φ = 62971509744.

The previous prime is 71320012193. The next prime is 71320012241. The reversal of 71320012231 is 13221002317.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-71320012231 is a prime.

It is a super-2 number, since 2×71320012231² (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 (71320012241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5178525 + ... + 5192278.

Almost surely, 2^71320012231 is an apocalyptic number.

71320012231 is a deficient number, since it is larger than the sum of its proper divisors (8970752337).

71320012231 is a wasteful number, since it uses less digits than its factorization.

71320012231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10370862 (or 10370839 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

Adding to 71320012231 its reverse (13221002317), we get a palindrome (84541014548).

The spelling of 71320012231 in words is "seventy-one billion, three hundred twenty million, twelve thousand, two hundred thirty-one".