869856981709 has 2 divisors, whose sum is σ = 869856981710. Its totient is φ = 869856981708.

The previous prime is 869856981703. The next prime is 869856981731. The reversal of 869856981709 is 907189658968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 865811640100 + 4045341609 = 930490^2 + 63603^2 .

It is a cyclic number.

It is not a de Polignac number, because 869856981709 - 2³ = 869856981701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (869856981701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434928490854 + 434928490855.

It is an arithmetic number, because the mean of its divisors is an integer number (434928490855).

Almost surely, 2^869856981709 is an apocalyptic number.

It is an amenable number.

869856981709 is a deficient number, since it is larger than the sum of its proper divisors (1).

869856981709 is an equidigital number, since it uses as much as digits as its factorization.

869856981709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 470292480, while the sum is 76.

The spelling of 869856981709 in words is "eight hundred sixty-nine billion, eight hundred fifty-six million, nine hundred eighty-one thousand, seven hundred nine".