11533251331 has 16 divisors (see below), whose sum is σ = 13258593216. Its totient is φ = 9827427456.

The previous prime is 11533251269. The next prime is 11533251341. The reversal of 11533251331 is 13315233511.

It is a happy number.

It is not a de Polignac number, because 11533251331 - 2²⁵ = 11499696899 is a prime.

It is a super-2 number, since 2×11533251331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11533251331.

It is not an unprimeable number, because it can be changed into a prime (11533251341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2199645 + ... + 2204881.

It is an arithmetic number, because the mean of its divisors is an integer number (828662076).

Almost surely, 2^11533251331 is an apocalyptic number.

11533251331 is a deficient number, since it is larger than the sum of its proper divisors (1725341885).

11533251331 is a wasteful number, since it uses less digits than its factorization.

11533251331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7038.

The product of its digits is 4050, while the sum is 28.

Adding to 11533251331 its reverse (13315233511), we get a palindrome (24848484842).

The spelling of 11533251331 in words is "eleven billion, five hundred thirty-three million, two hundred fifty-one thousand, three hundred thirty-one".