1312313209 has 2 divisors, whose sum is σ = 1312313210. Its totient is φ = 1312313208.

The previous prime is 1312313159. The next prime is 1312313237. The reversal of 1312313209 is 9023132131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1119103209 + 193210000 = 33453^2 + 13900^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312313209 - 2¹⁵ = 1312280441 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312313269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656156604 + 656156605.

It is an arithmetic number, because the mean of its divisors is an integer number (656156605).

Almost surely, 2^1312313209 is an apocalyptic number.

It is an amenable number.

1312313209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312313209 is an equidigital number, since it uses as much as digits as its factorization.

1312313209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 1312313209 is about 36225.8638130273. The cubic root of 1312313209 is about 1094.8278425231.

The spelling of 1312313209 in words is "one billion, three hundred twelve million, three hundred thirteen thousand, two hundred nine".