168609697 has 2 divisors, whose sum is σ = 168609698. Its totient is φ = 168609696.

The previous prime is 168609691. The next prime is 168609719. The reversal of 168609697 is 796906861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168194961 + 414736 = 12969^2 + 644^2 .

It is an emirp because it is prime and its reverse (796906861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168609697 - 2⁷ = 168609569 is a prime.

It is not a weakly prime, because it can be changed into another prime (168609691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84304848 + 84304849.

It is an arithmetic number, because the mean of its divisors is an integer number (84304849).

Almost surely, 2^168609697 is an apocalyptic number.

It is an amenable number.

168609697 is a deficient number, since it is larger than the sum of its proper divisors (1).

168609697 is an equidigital number, since it uses as much as digits as its factorization.

168609697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 168609697 is about 12984.9796688328. The cubic root of 168609697 is about 552.4515325037.

The spelling of 168609697 in words is "one hundred sixty-eight million, six hundred nine thousand, six hundred ninety-seven".