868690789 has 2 divisors, whose sum is σ = 868690790. Its totient is φ = 868690788.

The previous prime is 868690787. The next prime is 868690831. The reversal of 868690789 is 987096868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 738045889 + 130644900 = 27167^2 + 11430^2 .

It is a cyclic number.

It is not a de Polignac number, because 868690789 - 2¹ = 868690787 is a prime.

Together with 868690787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868690783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434345394 + 434345395.

It is an arithmetic number, because the mean of its divisors is an integer number (434345395).

Almost surely, 2^868690789 is an apocalyptic number.

It is an amenable number.

868690789 is a deficient number, since it is larger than the sum of its proper divisors (1).

868690789 is an equidigital number, since it uses as much as digits as its factorization.

868690789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10450944, while the sum is 61.

The square root of 868690789 is about 29473.5608469693. The cubic root of 868690789 is about 954.1611701706.

The spelling of 868690789 in words is "eight hundred sixty-eight million, six hundred ninety thousand, seven hundred eighty-nine".