11123231131 has 4 divisors (see below), whose sum is σ = 11150970264. Its totient is φ = 11095492000.

The previous prime is 11123231083. The next prime is 11123231137. The reversal of 11123231131 is 13113232111.

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 11123231131 - 2⁹ = 11123230619 is a prime.

It is a super-2 number, since 2×11123231131² (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 = 11123231099 and 11123231108.

It is not an unprimeable number, because it can be changed into a prime (11123231137) 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, 13868965 + ... + 13869766.

It is an arithmetic number, because the mean of its divisors is an integer number (2787742566).

Almost surely, 2^11123231131 is an apocalyptic number.

11123231131 is a deficient number, since it is larger than the sum of its proper divisors (27739133).

11123231131 is an equidigital number, since it uses as much as digits as its factorization.

11123231131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27739132.

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

Adding to 11123231131 its reverse (13113232111), we get a palindrome (24236463242).

The spelling of 11123231131 in words is "eleven billion, one hundred twenty-three million, two hundred thirty-one thousand, one hundred thirty-one".