9812171497 has 2 divisors, whose sum is σ = 9812171498. Its totient is φ = 9812171496.

The previous prime is 9812171441. The next prime is 9812171521. The reversal of 9812171497 is 7941712189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9804168256 + 8003241 = 99016^2 + 2829^2 .

It is an emirp because it is prime and its reverse (7941712189) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9812171497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9812171497.

It is not a weakly prime, because it can be changed into another prime (9812171437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4906085748 + 4906085749.

It is an arithmetic number, because the mean of its divisors is an integer number (4906085749).

Almost surely, 2^9812171497 is an apocalyptic number.

It is an amenable number.

9812171497 is a deficient number, since it is larger than the sum of its proper divisors (1).

9812171497 is an equidigital number, since it uses as much as digits as its factorization.

9812171497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 49.

The square root of 9812171497 is about 99056.4056333562. The cubic root of 9812171497 is about 2140.8605367428.

The spelling of 9812171497 in words is "nine billion, eight hundred twelve million, one hundred seventy-one thousand, four hundred ninety-seven".