12381722539 has 2 divisors, whose sum is σ = 12381722540. Its totient is φ = 12381722538.

The previous prime is 12381722497. The next prime is 12381722611. The reversal of 12381722539 is 93522718321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12381722539 - 2²¹ = 12379625387 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12381722495 and 12381722504.

It is not a weakly prime, because it can be changed into another prime (12381720539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6190861269 + 6190861270.

It is an arithmetic number, because the mean of its divisors is an integer number (6190861270).

Almost surely, 2^12381722539 is an apocalyptic number.

12381722539 is a deficient number, since it is larger than the sum of its proper divisors (1).

12381722539 is an equidigital number, since it uses as much as digits as its factorization.

12381722539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 43.

The spelling of 12381722539 in words is "twelve billion, three hundred eighty-one million, seven hundred twenty-two thousand, five hundred thirty-nine".