11203113231 has 12 divisors (see below), whose sum is σ = 16558607208. Its totient is φ = 7295050224.

The previous prime is 11203113199. The next prime is 11203113269. The reversal of 11203113231 is 13231130211.

11203113231 is a `hidden beast` number, since 1 + 120 + 311 + 3 + 231 = 666.

It is not a de Polignac number, because 11203113231 - 2⁵ = 11203113199 is a prime.

It is a super-2 number, since 2×11203113231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11203113731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14473920 + ... + 14474693.

It is an arithmetic number, because the mean of its divisors is an integer number (1379883934).

Almost surely, 2^11203113231 is an apocalyptic number.

11203113231 is a deficient number, since it is larger than the sum of its proper divisors (5355493977).

11203113231 is a wasteful number, since it uses less digits than its factorization.

11203113231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28948662 (or 28948659 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 11203113231 its reverse (13231130211), we get a palindrome (24434243442).

The spelling of 11203113231 in words is "eleven billion, two hundred three million, one hundred thirteen thousand, two hundred thirty-one".