868436609 has 2 divisors, whose sum is σ = 868436610. Its totient is φ = 868436608.

The previous prime is 868436521. The next prime is 868436623. The reversal of 868436609 is 906634868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 865536400 + 2900209 = 29420^2 + 1703^2 .

It is a cyclic number.

It is not a de Polignac number, because 868436609 - 2¹⁶ = 868371073 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (868436209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434218304 + 434218305.

It is an arithmetic number, because the mean of its divisors is an integer number (434218305).

Almost surely, 2^868436609 is an apocalyptic number.

It is an amenable number.

868436609 is a deficient number, since it is larger than the sum of its proper divisors (1).

868436609 is an equidigital number, since it uses as much as digits as its factorization.

868436609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1492992, while the sum is 50.

The square root of 868436609 is about 29469.2485313080. The cubic root of 868436609 is about 954.0680981793.

The spelling of 868436609 in words is "eight hundred sixty-eight million, four hundred thirty-six thousand, six hundred nine".