1310999128909 has 2 divisors, whose sum is σ = 1310999128910. Its totient is φ = 1310999128908.

The previous prime is 1310999128897. The next prime is 1310999128961. The reversal of 1310999128909 is 9098219990131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 752807846025 + 558191282884 = 867645^2 + 747122^2 .

It is an emirp because it is prime and its reverse (9098219990131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1310999128909 - 2¹¹ = 1310999126861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1310999128969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655499564454 + 655499564455.

It is an arithmetic number, because the mean of its divisors is an integer number (655499564455).

Almost surely, 2^{1310999128909} is an apocalyptic number.

It is an amenable number.

1310999128909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1310999128909 is an equidigital number, since it uses as much as digits as its factorization.

1310999128909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2834352, while the sum is 61.

The spelling of 1310999128909 in words is "one trillion, three hundred ten billion, nine hundred ninety-nine million, one hundred twenty-eight thousand, nine hundred nine".