11111131123 has 4 divisors (see below), whose sum is σ = 11111871760. Its totient is φ = 11110390488.

The previous prime is 11111131093. The next prime is 11111131127. The reversal of 11111131123 is 32113111111.

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 11111131123 - 2¹³ = 11111122931 is a prime.

It is a super-2 number, since 2×11111131123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111131097 and 11111131106.

It is not an unprimeable number, because it can be changed into a prime (11111131127) 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 3 ways as a sum of consecutive naturals, for example, 347340 + ... + 377977.

It is an arithmetic number, because the mean of its divisors is an integer number (2777967940).

Almost surely, 2^11111131123 is an apocalyptic number.

11111131123 is a deficient number, since it is larger than the sum of its proper divisors (740637).

11111131123 is an equidigital number, since it uses as much as digits as its factorization.

11111131123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740636.

The product of its digits is 18, while the sum is 16.

Adding to 11111131123 its reverse (32113111111), we get a palindrome (43224242234).

The spelling of 11111131123 in words is "eleven billion, one hundred eleven million, one hundred thirty-one thousand, one hundred twenty-three".