312021123439 has 2 divisors, whose sum is σ = 312021123440. Its totient is φ = 312021123438.

The previous prime is 312021123397. The next prime is 312021123497. The reversal of 312021123439 is 934321120213.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312021123439 - 2¹⁹ = 312020599151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 312021123439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312021121439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156010561719 + 156010561720.

It is an arithmetic number, because the mean of its divisors is an integer number (156010561720).

Almost surely, 2^312021123439 is an apocalyptic number.

312021123439 is a deficient number, since it is larger than the sum of its proper divisors (1).

312021123439 is an equidigital number, since it uses as much as digits as its factorization.

312021123439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 312021123439 in words is "three hundred twelve billion, twenty-one million, one hundred twenty-three thousand, four hundred thirty-nine".