1311877909 has 2 divisors, whose sum is σ = 1311877910. Its totient is φ = 1311877908.

The previous prime is 1311877891. The next prime is 1311877939. The reversal of 1311877909 is 9097781131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1293840900 + 18037009 = 35970^2 + 4247^2 .

It is an emirp because it is prime and its reverse (9097781131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1311877909 - 2⁵ = 1311877877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311877939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655938954 + 655938955.

It is an arithmetic number, because the mean of its divisors is an integer number (655938955).

Almost surely, 2^1311877909 is an apocalyptic number.

It is an amenable number.

1311877909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311877909 is an equidigital number, since it uses as much as digits as its factorization.

1311877909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 46.

The square root of 1311877909 is about 36219.8551764084. The cubic root of 1311877909 is about 1094.7067760834.

The spelling of 1311877909 in words is "one billion, three hundred eleven million, eight hundred seventy-seven thousand, nine hundred nine".