11113122131 has 4 divisors (see below), whose sum is σ = 11138437200. Its totient is φ = 11087807064.

The previous prime is 11113122127. The next prime is 11113122133. The reversal of 11113122131 is 13122131111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11113122131 - 2² = 11113122127 is a prime.

It is a super-2 number, since 2×11113122131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11113122133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12656876 + ... + 12657753.

It is an arithmetic number, because the mean of its divisors is an integer number (2784609300).

Almost surely, 2^11113122131 is an apocalyptic number.

11113122131 is a deficient number, since it is larger than the sum of its proper divisors (25315069).

11113122131 is an equidigital number, since it uses as much as digits as its factorization.

11113122131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25315068.

The product of its digits is 36, while the sum is 17.

Adding to 11113122131 its reverse (13122131111), we get a palindrome (24235253242).

It can be divided in two parts, 111 and 13122131, that multiplied together give a palindrome (1456556541).

The spelling of 11113122131 in words is "eleven billion, one hundred thirteen million, one hundred twenty-two thousand, one hundred thirty-one".