3121326938809 has 2 divisors, whose sum is σ = 3121326938810. Its totient is φ = 3121326938808.

The previous prime is 3121326938801. The next prime is 3121326938833. The reversal of 3121326938809 is 9088396231213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2712846173184 + 408480765625 = 1647072^2 + 639125^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121326938809 - 2³ = 3121326938801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3121326938809.

It is not a weakly prime, because it can be changed into another prime (3121326938801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560663469404 + 1560663469405.

It is an arithmetic number, because the mean of its divisors is an integer number (1560663469405).

Almost surely, 2^{3121326938809} is an apocalyptic number.

It is an amenable number.

3121326938809 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121326938809 is an equidigital number, since it uses as much as digits as its factorization.

3121326938809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 55.

The spelling of 3121326938809 in words is "three trillion, one hundred twenty-one billion, three hundred twenty-six million, nine hundred thirty-eight thousand, eight hundred nine".