312130031209 has 2 divisors, whose sum is σ = 312130031210. Its totient is φ = 312130031208.

The previous prime is 312130031203. The next prime is 312130031219. The reversal of 312130031209 is 902130031213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196733941209 + 115396090000 = 443547^2 + 339700^2 .

It is a cyclic number.

It is not a de Polignac number, because 312130031209 - 2¹¹ = 312130029161 is a prime.

It is not a weakly prime, because it can be changed into another prime (312130031203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156065015604 + 156065015605.

It is an arithmetic number, because the mean of its divisors is an integer number (156065015605).

Almost surely, 2^312130031209 is an apocalyptic number.

It is an amenable number.

312130031209 is a deficient number, since it is larger than the sum of its proper divisors (1).

312130031209 is an equidigital number, since it uses as much as digits as its factorization.

312130031209 is an evil number, because the sum of its binary digits is even.

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

The spelling of 312130031209 in words is "three hundred twelve billion, one hundred thirty million, thirty-one thousand, two hundred nine".