12729747539 has 2 divisors, whose sum is σ = 12729747540. Its totient is φ = 12729747538.

The previous prime is 12729747449. The next prime is 12729747551. The reversal of 12729747539 is 93574792721.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12729747539 - 2¹⁶ = 12729682003 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12729747559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6364873769 + 6364873770.

It is an arithmetic number, because the mean of its divisors is an integer number (6364873770).

Almost surely, 2^12729747539 is an apocalyptic number.

12729747539 is a deficient number, since it is larger than the sum of its proper divisors (1).

12729747539 is an equidigital number, since it uses as much as digits as its factorization.

12729747539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6667920, while the sum is 56.

The spelling of 12729747539 in words is "twelve billion, seven hundred twenty-nine million, seven hundred forty-seven thousand, five hundred thirty-nine".