68439109 has 2 divisors, whose sum is σ = 68439110. Its totient is φ = 68439108.

The previous prime is 68439079. The next prime is 68439113. The reversal of 68439109 is 90193486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52519009 + 15920100 = 7247^2 + 3990^2 .

It is a cyclic number.

It is not a de Polignac number, because 68439109 - 2¹³ = 68430917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68439139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34219554 + 34219555.

It is an arithmetic number, because the mean of its divisors is an integer number (34219555).

Almost surely, 2^68439109 is an apocalyptic number.

It is an amenable number.

68439109 is a deficient number, since it is larger than the sum of its proper divisors (1).

68439109 is an equidigital number, since it uses as much as digits as its factorization.

68439109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 68439109 is about 8272.7933009353. The cubic root of 68439109 is about 409.0422000802.

It can be divided in two parts, 684 and 39109, that added together give a palindrome (39793).

The spelling of 68439109 in words is "sixty-eight million, four hundred thirty-nine thousand, one hundred nine".