39506489809 has 2 divisors, whose sum is σ = 39506489810. Its totient is φ = 39506489808.

The previous prime is 39506489797. The next prime is 39506489863. The reversal of 39506489809 is 90898460593.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34769196225 + 4737293584 = 186465^2 + 68828^2 .

It is a cyclic number.

It is not a de Polignac number, because 39506489809 - 2²⁷ = 39372272081 is a prime.

It is not a weakly prime, because it can be changed into another prime (39506489899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19753244904 + 19753244905.

It is an arithmetic number, because the mean of its divisors is an integer number (19753244905).

Almost surely, 2^39506489809 is an apocalyptic number.

It is an amenable number.

39506489809 is a deficient number, since it is larger than the sum of its proper divisors (1).

39506489809 is an equidigital number, since it uses as much as digits as its factorization.

39506489809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16796160, while the sum is 61.

The spelling of 39506489809 in words is "thirty-nine billion, five hundred six million, four hundred eighty-nine thousand, eight hundred nine".