68545909 has 2 divisors, whose sum is σ = 68545910. Its totient is φ = 68545908.

The previous prime is 68545903. The next prime is 68545933. The reversal of 68545909 is 90954586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68013009 + 532900 = 8247^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 68545909 - 2⁷ = 68545781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68545903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34272954 + 34272955.

It is an arithmetic number, because the mean of its divisors is an integer number (34272955).

Almost surely, 2^68545909 is an apocalyptic number.

It is an amenable number.

68545909 is a deficient number, since it is larger than the sum of its proper divisors (1).

68545909 is an equidigital number, since it uses as much as digits as its factorization.

68545909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 68545909 is about 8279.2456782004. The cubic root of 68545909 is about 409.2548611511.

The spelling of 68545909 in words is "sixty-eight million, five hundred forty-five thousand, nine hundred nine".