313122131209 has 2 divisors, whose sum is σ = 313122131210. Its totient is φ = 313122131208.

The previous prime is 313122131207. The next prime is 313122131213. The reversal of 313122131209 is 902131221313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 312028374025 + 1093757184 = 558595^2 + 33072^2 .

It is a cyclic number.

It is not a de Polignac number, because 313122131209 - 2¹ = 313122131207 is a prime.

Together with 313122131207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (313122131207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156561065604 + 156561065605.

It is an arithmetic number, because the mean of its divisors is an integer number (156561065605).

Almost surely, 2^313122131209 is an apocalyptic number.

It is an amenable number.

313122131209 is a deficient number, since it is larger than the sum of its proper divisors (1).

313122131209 is an equidigital number, since it uses as much as digits as its factorization.

313122131209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The spelling of 313122131209 in words is "three hundred thirteen billion, one hundred twenty-two million, one hundred thirty-one thousand, two hundred nine".