81707317113271 has 4 divisors (see below), whose sum is σ = 81707464881000. Its totient is φ = 81707169345544.

The previous prime is 81707317113203. The next prime is 81707317113277. The reversal of 81707317113271 is 17231171370718.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81707317113271 - 2¹⁷ = 81707316982199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81707317113277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73051321 + ... + 74161378.

It is an arithmetic number, because the mean of its divisors is an integer number (20426866220250).

Almost surely, 2^{81707317113271} is an apocalyptic number.

81707317113271 is a deficient number, since it is larger than the sum of its proper divisors (147767729).

81707317113271 is a wasteful number, since it uses less digits than its factorization.

81707317113271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147767728.

The product of its (nonzero) digits is 345744, while the sum is 49.

Adding to 81707317113271 its reverse (17231171370718), we get a palindrome (98938488483989).

The spelling of 81707317113271 in words is "eighty-one trillion, seven hundred seven billion, three hundred seventeen million, one hundred thirteen thousand, two hundred seventy-one".