68909 has 2 divisors, whose sum is σ = 68910. Its totient is φ = 68908.

The previous prime is 68903. The next prime is 68917. The reversal of 68909 is 90986.

Added to its reverse (90986) it gives a triangular number (159895 = T₅₆₅).

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64009 + 4900 = 253^2 + 70^2 .

It is a cyclic number.

It is not a de Polignac number, because 68909 - 2¹⁶ = 3373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34454 + 34455.

It is an arithmetic number, because the mean of its divisors is an integer number (34455).

2⁶⁸⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

68909 is a deficient number, since it is larger than the sum of its proper divisors (1).

68909 is an equidigital number, since it uses as much as digits as its factorization.

68909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 68909 is about 262.5052380430. The cubic root of 68909 is about 40.9976203259.

Adding to 68909 its reverse (90986), we get a triangular number (159895 = T₅₆₅).

The spelling of 68909 in words is "sixty-eight thousand, nine hundred nine".