9771720097 has 2 divisors, whose sum is σ = 9771720098. Its totient is φ = 9771720096.

The previous prime is 9771720001. The next prime is 9771720169. The reversal of 9771720097 is 7900271779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9547439521 + 224280576 = 97711^2 + 14976^2 .

It is a cyclic number.

It is not a de Polignac number, because 9771720097 - 2¹¹ = 9771718049 is a prime.

It is a super-2 number, since 2×9771720097² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9771720097.

It is not a weakly prime, because it can be changed into another prime (9771720997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4885860048 + 4885860049.

It is an arithmetic number, because the mean of its divisors is an integer number (4885860049).

Almost surely, 2^9771720097 is an apocalyptic number.

It is an amenable number.

9771720097 is a deficient number, since it is larger than the sum of its proper divisors (1).

9771720097 is an equidigital number, since it uses as much as digits as its factorization.

9771720097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388962, while the sum is 49.

The square root of 9771720097 is about 98852.0110923394. The cubic root of 9771720097 is about 2137.9145328834.

The spelling of 9771720097 in words is "nine billion, seven hundred seventy-one million, seven hundred twenty thousand, ninety-seven".