71731318 has 4 divisors (see below), whose sum is σ = 107596980. Its totient is φ = 35865658.

The previous prime is 71731307. The next prime is 71731337. The reversal of 71731318 is 81313717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81313717 = 23 ⋅3535379.

It is a self number, because there is not a number n which added to its sum of digits gives 71731318.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17932828 + ... + 17932831.

It is an arithmetic number, because the mean of its divisors is an integer number (26899245).

Almost surely, 2^71731318 is an apocalyptic number.

71731318 is a deficient number, since it is larger than the sum of its proper divisors (35865662).

71731318 is a wasteful number, since it uses less digits than its factorization.

71731318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35865661.

The product of its digits is 3528, while the sum is 31.

The square root of 71731318 is about 8469.4343376639. The cubic root of 71731318 is about 415.4986370940.

The spelling of 71731318 in words is "seventy-one million, seven hundred thirty-one thousand, three hundred eighteen".