312542018909 has 2 divisors, whose sum is σ = 312542018910. Its totient is φ = 312542018908.

The previous prime is 312542018881. The next prime is 312542019011. The reversal of 312542018909 is 909810245213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249322459684 + 63219559225 = 499322^2 + 251435^2 .

It is an emirp because it is prime and its reverse (909810245213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312542018909 - 2⁸ = 312542018653 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 312542018909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312542018209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156271009454 + 156271009455.

It is an arithmetic number, because the mean of its divisors is an integer number (156271009455).

Almost surely, 2^312542018909 is an apocalyptic number.

It is an amenable number.

312542018909 is a deficient number, since it is larger than the sum of its proper divisors (1).

312542018909 is an equidigital number, since it uses as much as digits as its factorization.

312542018909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 312542018909 in words is "three hundred twelve billion, five hundred forty-two million, eighteen thousand, nine hundred nine".