9797887997 has 2 divisors, whose sum is σ = 9797887998. Its totient is φ = 9797887996.

The previous prime is 9797887943. The next prime is 9797888057. The reversal of 9797887997 is 7997887979.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9797238361 + 649636 = 98981^2 + 806^2 .

It is an emirp because it is prime and its reverse (7997887979) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9797887997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9797887907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4898943998 + 4898943999.

It is an arithmetic number, because the mean of its divisors is an integer number (4898943999).

Almost surely, 2^9797887997 is an apocalyptic number.

It is an amenable number.

9797887997 is a deficient number, since it is larger than the sum of its proper divisors (1).

9797887997 is an equidigital number, since it uses as much as digits as its factorization.

9797887997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008189504, while the sum is 80.

The square root of 9797887997 is about 98984.2815653071. The cubic root of 9797887997 is about 2139.8212210535.

The spelling of 9797887997 in words is "nine billion, seven hundred ninety-seven million, eight hundred eighty-seven thousand, nine hundred ninety-seven".