11123011231 has 8 divisors (see below), whose sum is σ = 11371437360. Its totient is φ = 10877009088.

The previous prime is 11123011199. The next prime is 11123011253. The reversal of 11123011231 is 13211032111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11123011231 - 2⁵ = 11123011199 is a prime.

It is a super-2 number, since 2×11123011231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123011831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 596716 + ... + 615073.

It is an arithmetic number, because the mean of its divisors is an integer number (1421429670).

Almost surely, 2^11123011231 is an apocalyptic number.

11123011231 is a deficient number, since it is larger than the sum of its proper divisors (248426129).

11123011231 is a wasteful number, since it uses less digits than its factorization.

11123011231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211993.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 11123011231 its reverse (13211032111), we get a palindrome (24334043342).

The spelling of 11123011231 in words is "eleven billion, one hundred twenty-three million, eleven thousand, two hundred thirty-one".