312311318918909 has 2 divisors, whose sum is σ = 312311318918910. Its totient is φ = 312311318918908.

The previous prime is 312311318918897. The next prime is 312311318918947. The reversal of 312311318918909 is 909819813113213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 312264347026009 + 46971892900 = 17671003^2 + 216730^2 .

It is an emirp because it is prime and its reverse (909819813113213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312311318918909 - 2²⁰ = 312311317870333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312311318911909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156155659459454 + 156155659459455.

It is an arithmetic number, because the mean of its divisors is an integer number (156155659459455).

Almost surely, 2^{312311318918909} is an apocalyptic number.

It is an amenable number.

312311318918909 is a deficient number, since it is larger than the sum of its proper divisors (1).

312311318918909 is an equidigital number, since it uses as much as digits as its factorization.

312311318918909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 59.

The spelling of 312311318918909 in words is "three hundred twelve trillion, three hundred eleven billion, three hundred eighteen million, nine hundred eighteen thousand, nine hundred nine".