71313231318 has 128 divisors (see below), whose sum is σ = 174157516800. Its totient is φ = 19036351488.

The previous prime is 71313231317. The next prime is 71313231323. The reversal of 71313231318 is 81313231317.

It is a super-2 number, since 2×71313231318² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71313231313) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5087896 + ... + 5101892.

It is an arithmetic number, because the mean of its divisors is an integer number (1360605600).

Almost surely, 2^71313231318 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71313231318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87078758400).

71313231318 is an abundant number, since it is smaller than the sum of its proper divisors (102844285482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71313231318 is a wasteful number, since it uses less digits than its factorization.

71313231318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14174.

The product of its digits is 9072, while the sum is 33.

Subtracting 71313231318 from its reverse (81313231317), we obtain a palindrome (9999999999).

The spelling of 71313231318 in words is "seventy-one billion, three hundred thirteen million, two hundred thirty-one thousand, three hundred eighteen".