868693109 has 2 divisors, whose sum is σ = 868693110. Its totient is φ = 868693108.

The previous prime is 868693097. The next prime is 868693127. The reversal of 868693109 is 901396868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 803439025 + 65254084 = 28345^2 + 8078^2 .

It is a cyclic number.

It is not a de Polignac number, because 868693109 - 2⁴ = 868693093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868693159) 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, 434346554 + 434346555.

It is an arithmetic number, because the mean of its divisors is an integer number (434346555).

Almost surely, 2^868693109 is an apocalyptic number.

It is an amenable number.

868693109 is a deficient number, since it is larger than the sum of its proper divisors (1).

868693109 is an equidigital number, since it uses as much as digits as its factorization.

868693109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 868693109 is about 29473.6002042506. The cubic root of 868693109 is about 954.1620195914.

The spelling of 868693109 in words is "eight hundred sixty-eight million, six hundred ninety-three thousand, one hundred nine".