97897079809 has 2 divisors, whose sum is σ = 97897079810. Its totient is φ = 97897079808.

The previous prime is 97897079771. The next prime is 97897079831. The reversal of 97897079809 is 90897079879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79284480625 + 18612599184 = 281575^2 + 136428^2 .

It is a cyclic number.

It is not a de Polignac number, because 97897079809 - 2³³ = 89307145217 is a prime.

It is not a weakly prime, because it can be changed into another prime (97897079879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48948539904 + 48948539905.

It is an arithmetic number, because the mean of its divisors is an integer number (48948539905).

Almost surely, 2^97897079809 is an apocalyptic number.

It is an amenable number.

97897079809 is a deficient number, since it is larger than the sum of its proper divisors (1).

97897079809 is an equidigital number, since it uses as much as digits as its factorization.

97897079809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144027072, while the sum is 73.

The spelling of 97897079809 in words is "ninety-seven billion, eight hundred ninety-seven million, seventy-nine thousand, eight hundred nine".