97915617109 has 2 divisors, whose sum is σ = 97915617110. Its totient is φ = 97915617108.

The previous prime is 97915617067. The next prime is 97915617143. The reversal of 97915617109 is 90171651979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83161870884 + 14753746225 = 288378^2 + 121465^2 .

It is a cyclic number.

It is not a de Polignac number, because 97915617109 - 2³³ = 89325682517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97915617109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97915617169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48957808554 + 48957808555.

It is an arithmetic number, because the mean of its divisors is an integer number (48957808555).

Almost surely, 2^97915617109 is an apocalyptic number.

It is an amenable number.

97915617109 is a deficient number, since it is larger than the sum of its proper divisors (1).

97915617109 is an equidigital number, since it uses as much as digits as its factorization.

97915617109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1071630, while the sum is 55.

The spelling of 97915617109 in words is "ninety-seven billion, nine hundred fifteen million, six hundred seventeen thousand, one hundred nine".