11530531523 has 16 divisors (see below), whose sum is σ = 13321963200. Its totient is φ = 9775282176.

The previous prime is 11530531471. The next prime is 11530531553. The reversal of 11530531523 is 32513503511.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11530531523 - 2⁶ = 11530531459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11530531553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1319015 + ... + 1327727.

It is an arithmetic number, because the mean of its divisors is an integer number (832622700).

Almost surely, 2^11530531523 is an apocalyptic number.

11530531523 is a deficient number, since it is larger than the sum of its proper divisors (1791431677).

11530531523 is an equidigital number, since it uses as much as digits as its factorization.

11530531523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10766.

The product of its (nonzero) digits is 6750, while the sum is 29.

The spelling of 11530531523 in words is "eleven billion, five hundred thirty million, five hundred thirty-one thousand, five hundred twenty-three".