97687574209 has 2 divisors, whose sum is σ = 97687574210. Its totient is φ = 97687574208.

The previous prime is 97687574197. The next prime is 97687574227. The reversal of 97687574209 is 90247578679.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92829902400 + 4857671809 = 304680^2 + 69697^2 .

It is an emirp because it is prime and its reverse (90247578679) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97687574209 - 2²⁵ = 97654019777 is a prime.

It is not a weakly prime, because it can be changed into another prime (97687574239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48843787104 + 48843787105.

It is an arithmetic number, because the mean of its divisors is an integer number (48843787105).

Almost surely, 2^97687574209 is an apocalyptic number.

It is an amenable number.

97687574209 is a deficient number, since it is larger than the sum of its proper divisors (1).

97687574209 is an equidigital number, since it uses as much as digits as its factorization.

97687574209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53343360, while the sum is 64.

The spelling of 97687574209 in words is "ninety-seven billion, six hundred eighty-seven million, five hundred seventy-four thousand, two hundred nine".