312012431909 has 2 divisors, whose sum is σ = 312012431910. Its totient is φ = 312012431908.

The previous prime is 312012431903. The next prime is 312012432013. The reversal of 312012431909 is 909134210213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171248647684 + 140763784225 = 413822^2 + 375185^2 .

It is a cyclic number.

It is not a de Polignac number, because 312012431909 - 2²⁸ = 311743996453 is a prime.

It is a super-2 number, since 2×312012431909² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312012431903) 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, 156006215954 + 156006215955.

It is an arithmetic number, because the mean of its divisors is an integer number (156006215955).

Almost surely, 2^312012431909 is an apocalyptic number.

It is an amenable number.

312012431909 is a deficient number, since it is larger than the sum of its proper divisors (1).

312012431909 is an equidigital number, since it uses as much as digits as its factorization.

312012431909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The spelling of 312012431909 in words is "three hundred twelve billion, twelve million, four hundred thirty-one thousand, nine hundred nine".