97685647309 has 2 divisors, whose sum is σ = 97685647310. Its totient is φ = 97685647308.

The previous prime is 97685647259. The next prime is 97685647351. The reversal of 97685647309 is 90374658679.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60063226084 + 37622421225 = 245078^2 + 193965^2 .

It is a cyclic number.

It is not a de Polignac number, because 97685647309 - 2¹⁵ = 97685614541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97685642309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48842823654 + 48842823655.

It is an arithmetic number, because the mean of its divisors is an integer number (48842823655).

Almost surely, 2^97685647309 is an apocalyptic number.

It is an amenable number.

97685647309 is a deficient number, since it is larger than the sum of its proper divisors (1).

97685647309 is an equidigital number, since it uses as much as digits as its factorization.

97685647309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68584320, while the sum is 64.

The spelling of 97685647309 in words is "ninety-seven billion, six hundred eighty-five million, six hundred forty-seven thousand, three hundred nine".