971747983520917 has 4 divisors (see below), whose sum is σ = 973992205192300. Its totient is φ = 969503761849536.

The previous prime is 971747983520911. The next prime is 971747983521011. The reversal of 971747983520917 is 719025389747179.

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

It can be written as a sum of positive squares in 2 ways, for example, as 259985665613041 + 711762317907876 = 16124071^2 + 26678874^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-971747983520917 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 (971747983520911) 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, 1122110835042 + ... + 1122110835907.

It is an arithmetic number, because the mean of its divisors is an integer number (243498051298075).

Almost surely, 2^{971747983520917} is an apocalyptic number.

It is an amenable number.

971747983520917 is a deficient number, since it is larger than the sum of its proper divisors (2244221671383).

971747983520917 is a wasteful number, since it uses less digits than its factorization.

971747983520917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2244221671382.

The product of its (nonzero) digits is 1680315840, while the sum is 79.

The spelling of 971747983520917 in words is "nine hundred seventy-one trillion, seven hundred forty-seven billion, nine hundred eighty-three million, five hundred twenty thousand, nine hundred seventeen".