81171713 has 8 divisors (see below), whose sum is σ = 92858880. Its totient is φ = 69507360.

The previous prime is 81171709. The next prime is 81171749. The reversal of 81171713 is 31717118.

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 81171713 - 2² = 81171709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81171703) 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, 2768 + ... + 13038.

It is an arithmetic number, because the mean of its divisors is an integer number (11607360).

Almost surely, 2^81171713 is an apocalyptic number.

It is an amenable number.

81171713 is a deficient number, since it is larger than the sum of its proper divisors (11687167).

81171713 is a wasteful number, since it uses less digits than its factorization.

81171713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11407.

The product of its digits is 1176, while the sum is 29.

The square root of 81171713 is about 9009.5345606752. The cubic root of 81171713 is about 432.9803997407.

The spelling of 81171713 in words is "eighty-one million, one hundred seventy-one thousand, seven hundred thirteen".