71731681 has 8 divisors (see below), whose sum is σ = 82047744. Its totient is φ = 61432800.

The previous prime is 71731679. The next prime is 71731717. The reversal of 71731681 is 18613717.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71731681 - 2¹ = 71731679 is a prime.

It is a super-2 number, since 2×71731681² = 10290868118171522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71731661) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 6456 + ... + 13606.

It is an arithmetic number, because the mean of its divisors is an integer number (10255968).

Almost surely, 2^71731681 is an apocalyptic number.

It is an amenable number.

71731681 is a deficient number, since it is larger than the sum of its proper divisors (10316063).

71731681 is a wasteful number, since it uses less digits than its factorization.

71731681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8591.

The product of its digits is 7056, while the sum is 34.

The square root of 71731681 is about 8469.4557676394. The cubic root of 71731681 is about 415.4993379768.

The spelling of 71731681 in words is "seventy-one million, seven hundred thirty-one thousand, six hundred eighty-one".