868869109 has 2 divisors, whose sum is σ = 868869110. Its totient is φ = 868869108.

The previous prime is 868869077. The next prime is 868869161. The reversal of 868869109 is 901968868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 660644209 + 208224900 = 25703^2 + 14430^2 .

It is a cyclic number.

It is not a de Polignac number, because 868869109 - 2⁵ = 868869077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 868869109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868864109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434434554 + 434434555.

It is an arithmetic number, because the mean of its divisors is an integer number (434434555).

Almost surely, 2^868869109 is an apocalyptic number.

It is an amenable number.

868869109 is a deficient number, since it is larger than the sum of its proper divisors (1).

868869109 is an equidigital number, since it uses as much as digits as its factorization.

868869109 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 55.

The square root of 868869109 is about 29476.5857758323. The cubic root of 868869109 is about 954.2264539982.

The spelling of 868869109 in words is "eight hundred sixty-eight million, eight hundred sixty-nine thousand, one hundred nine".