81117317 has 8 divisors (see below), whose sum is σ = 82320000. Its totient is φ = 79922304.

The previous prime is 81117293. The next prime is 81117331. The reversal of 81117317 is 71371118.

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 81117317 - 2¹⁴ = 81100933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81117317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81117367) 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, 21434 + ... + 24932.

It is an arithmetic number, because the mean of its divisors is an integer number (10290000).

Almost surely, 2^81117317 is an apocalyptic number.

It is an amenable number.

81117317 is a deficient number, since it is larger than the sum of its proper divisors (1202683).

81117317 is a wasteful number, since it uses less digits than its factorization.

81117317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3835.

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

The square root of 81117317 is about 9006.5152528600. The cubic root of 81117317 is about 432.8836596983.

The spelling of 81117317 in words is "eighty-one million, one hundred seventeen thousand, three hundred seventeen".