68831909 has 2 divisors, whose sum is σ = 68831910. Its totient is φ = 68831908.

The previous prime is 68831899. The next prime is 68831921. The reversal of 68831909 is 90913886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34550884 + 34281025 = 5878^2 + 5855^2 .

It is a cyclic number.

It is not a de Polignac number, because 68831909 - 2¹² = 68827813 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 68831909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68831999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34415954 + 34415955.

It is an arithmetic number, because the mean of its divisors is an integer number (34415955).

Almost surely, 2^68831909 is an apocalyptic number.

It is an amenable number.

68831909 is a deficient number, since it is larger than the sum of its proper divisors (1).

68831909 is an equidigital number, since it uses as much as digits as its factorization.

68831909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 68831909 is about 8296.4998041343. The cubic root of 68831909 is about 409.8232611233.

The spelling of 68831909 in words is "sixty-eight million, eight hundred thirty-one thousand, nine hundred nine".