12401309 has 2 divisors, whose sum is σ = 12401310. Its totient is φ = 12401308.

The previous prime is 12401293. The next prime is 12401317. The reversal of 12401309 is 90310421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10432900 + 1968409 = 3230^2 + 1403^2 .

It is an emirp because it is prime and its reverse (90310421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12401309 - 2⁴ = 12401293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12401369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6200654 + 6200655.

It is an arithmetic number, because the mean of its divisors is an integer number (6200655).

Almost surely, 2^12401309 is an apocalyptic number.

It is an amenable number.

12401309 is a deficient number, since it is larger than the sum of its proper divisors (1).

12401309 is an equidigital number, since it uses as much as digits as its factorization.

12401309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 12401309 is about 3521.5492329371. The cubic root of 12401309 is about 231.4670497818.

The spelling of 12401309 in words is "twelve million, four hundred one thousand, three hundred nine".