316564781209 has 2 divisors, whose sum is σ = 316564781210. Its totient is φ = 316564781208.

The previous prime is 316564781207. The next prime is 316564781279. The reversal of 316564781209 is 902187465613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 281804907609 + 34759873600 = 530853^2 + 186440^2 .

It is a cyclic number.

It is not a de Polignac number, because 316564781209 - 2¹ = 316564781207 is a prime.

Together with 316564781207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (316564781207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158282390604 + 158282390605.

It is an arithmetic number, because the mean of its divisors is an integer number (158282390605).

It is a 1-persistent number, because it is pandigital, but 2⋅316564781209 = 633129562418 is not.

Almost surely, 2^316564781209 is an apocalyptic number.

It is an amenable number.

316564781209 is a deficient number, since it is larger than the sum of its proper divisors (1).

316564781209 is an equidigital number, since it uses as much as digits as its factorization.

316564781209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 316564781209 in words is "three hundred sixteen billion, five hundred sixty-four million, seven hundred eighty-one thousand, two hundred nine".