312111321409 has 2 divisors, whose sum is σ = 312111321410. Its totient is φ = 312111321408.

The previous prime is 312111321391. The next prime is 312111321439. The reversal of 312111321409 is 904123111213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306074497600 + 6036823809 = 553240^2 + 77697^2 .

It is a cyclic number.

It is not a de Polignac number, because 312111321409 - 2¹¹ = 312111319361 is a prime.

It is not a weakly prime, because it can be changed into another prime (312111321439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156055660704 + 156055660705.

It is an arithmetic number, because the mean of its divisors is an integer number (156055660705).

Almost surely, 2^312111321409 is an apocalyptic number.

It is an amenable number.

312111321409 is a deficient number, since it is larger than the sum of its proper divisors (1).

312111321409 is an equidigital number, since it uses as much as digits as its factorization.

312111321409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 312111321409 in words is "three hundred twelve billion, one hundred eleven million, three hundred twenty-one thousand, four hundred nine".