39911121209 has 2 divisors, whose sum is σ = 39911121210. Its totient is φ = 39911121208.

The previous prime is 39911121181. The next prime is 39911121253. The reversal of 39911121209 is 90212111993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29618410000 + 10292711209 = 172100^2 + 101453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39911121209 is a prime.

It is not a weakly prime, because it can be changed into another prime (39911126209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19955560604 + 19955560605.

It is an arithmetic number, because the mean of its divisors is an integer number (19955560605).

Almost surely, 2^39911121209 is an apocalyptic number.

It is an amenable number.

39911121209 is a deficient number, since it is larger than the sum of its proper divisors (1).

39911121209 is an equidigital number, since it uses as much as digits as its factorization.

39911121209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 38.

The spelling of 39911121209 in words is "thirty-nine billion, nine hundred eleven million, one hundred twenty-one thousand, two hundred nine".