168609691 has 2 divisors, whose sum is σ = 168609692. Its totient is φ = 168609690.

The previous prime is 168609677. The next prime is 168609697. The reversal of 168609691 is 196906861.

168609691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 168609691 - 2⁵ = 168609659 is a prime.

It is not a weakly prime, because it can be changed into another prime (168609697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84304845 + 84304846.

It is an arithmetic number, because the mean of its divisors is an integer number (84304846).

Almost surely, 2^168609691 is an apocalyptic number.

168609691 is a deficient number, since it is larger than the sum of its proper divisors (1).

168609691 is an equidigital number, since it uses as much as digits as its factorization.

168609691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 168609691 is about 12984.9794377966. The cubic root of 168609691 is about 552.4515259507.

The spelling of 168609691 in words is "one hundred sixty-eight million, six hundred nine thousand, six hundred ninety-one".