11223131131 has 4 divisors (see below), whose sum is σ = 11227354600. Its totient is φ = 11218907664.

The previous prime is 11223131093. The next prime is 11223131197. The reversal of 11223131131 is 13113132211.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11223131131 is a prime.

It is a super-2 number, since 2×11223131131² (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 = 11223131099 and 11223131108.

It is not an unprimeable number, because it can be changed into a prime (11223141131) 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, 2107746 + ... + 2113063.

It is an arithmetic number, because the mean of its divisors is an integer number (2806838650).

Almost surely, 2^11223131131 is an apocalyptic number.

11223131131 is a deficient number, since it is larger than the sum of its proper divisors (4223469).

11223131131 is an equidigital number, since it uses as much as digits as its factorization.

11223131131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4223468.

The product of its digits is 108, while the sum is 19.

Adding to 11223131131 its reverse (13113132211), we get a palindrome (24336263342).

The spelling of 11223131131 in words is "eleven billion, two hundred twenty-three million, one hundred thirty-one thousand, one hundred thirty-one".