1388433309209 has 2 divisors, whose sum is σ = 1388433309210. Its totient is φ = 1388433309208.

The previous prime is 1388433309041. The next prime is 1388433309239. The reversal of 1388433309209 is 9029033348831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 862595137600 + 525838171609 = 928760^2 + 725147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1388433309209 is a prime.

It is not a weakly prime, because it can be changed into another prime (1388433309239) 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, 694216654604 + 694216654605.

It is an arithmetic number, because the mean of its divisors is an integer number (694216654605).

Almost surely, 2^{1388433309209} is an apocalyptic number.

It is an amenable number.

1388433309209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388433309209 is an equidigital number, since it uses as much as digits as its factorization.

1388433309209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 53.

The spelling of 1388433309209 in words is "one trillion, three hundred eighty-eight billion, four hundred thirty-three million, three hundred nine thousand, two hundred nine".