39381935609 has 2 divisors, whose sum is σ = 39381935610. Its totient is φ = 39381935608.

The previous prime is 39381935563. The next prime is 39381935623. The reversal of 39381935609 is 90653918393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26510352400 + 12871583209 = 162820^2 + 113453^2 .

It is an emirp because it is prime and its reverse (90653918393) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39381935609 is a prime.

It is a super-2 number, since 2×39381935609² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39381934609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19690967804 + 19690967805.

It is an arithmetic number, because the mean of its divisors is an integer number (19690967805).

Almost surely, 2^39381935609 is an apocalyptic number.

It is an amenable number.

39381935609 is a deficient number, since it is larger than the sum of its proper divisors (1).

39381935609 is an equidigital number, since it uses as much as digits as its factorization.

39381935609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4723920, while the sum is 56.

The spelling of 39381935609 in words is "thirty-nine billion, three hundred eighty-one million, nine hundred thirty-five thousand, six hundred nine".