168609569 has 2 divisors, whose sum is σ = 168609570. Its totient is φ = 168609568.

The previous prime is 168609559. The next prime is 168609577. The reversal of 168609569 is 965906861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127803025 + 40806544 = 11305^2 + 6388^2 .

It is a cyclic number.

It is not a de Polignac number, because 168609569 - 2⁸ = 168609313 is a prime.

It is a super-2 number, since 2×168609569² = 56858373516731522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (168609559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84304784 + 84304785.

It is an arithmetic number, because the mean of its divisors is an integer number (84304785).

Almost surely, 2^168609569 is an apocalyptic number.

It is an amenable number.

168609569 is a deficient number, since it is larger than the sum of its proper divisors (1).

168609569 is an equidigital number, since it uses as much as digits as its factorization.

168609569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 168609569 is about 12984.9747400601. The cubic root of 168609569 is about 552.4513927058.

The spelling of 168609569 in words is "one hundred sixty-eight million, six hundred nine thousand, five hundred sixty-nine".