12539550571 has 2 divisors, whose sum is σ = 12539550572. Its totient is φ = 12539550570.

The previous prime is 12539550559. The next prime is 12539550587. The reversal of 12539550571 is 17505593521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12539550571 - 2⁹ = 12539550059 is a prime.

It is not a weakly prime, because it can be changed into another prime (12539550521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6269775285 + 6269775286.

It is an arithmetic number, because the mean of its divisors is an integer number (6269775286).

Almost surely, 2^12539550571 is an apocalyptic number.

12539550571 is a deficient number, since it is larger than the sum of its proper divisors (1).

12539550571 is an equidigital number, since it uses as much as digits as its factorization.

12539550571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 236250, while the sum is 43.

The spelling of 12539550571 in words is "twelve billion, five hundred thirty-nine million, five hundred fifty thousand, five hundred seventy-one".