11231856529 has 2 divisors, whose sum is σ = 11231856530. Its totient is φ = 11231856528.

The previous prime is 11231856527. The next prime is 11231856557. The reversal of 11231856529 is 92565813211.

11231856529 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5987200129 + 5244656400 = 77377^2 + 72420^2 .

It is an emirp because it is prime and its reverse (92565813211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11231856529 - 2¹ = 11231856527 is a prime.

Together with 11231856527, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11231856523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5615928264 + 5615928265.

It is an arithmetic number, because the mean of its divisors is an integer number (5615928265).

Almost surely, 2^11231856529 is an apocalyptic number.

It is an amenable number.

11231856529 is a deficient number, since it is larger than the sum of its proper divisors (1).

11231856529 is an equidigital number, since it uses as much as digits as its factorization.

11231856529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 43.

The spelling of 11231856529 in words is "eleven billion, two hundred thirty-one million, eight hundred fifty-six thousand, five hundred twenty-nine".