11823131 has 4 divisors (see below), whose sum is σ = 11831664. Its totient is φ = 11814600.

The previous prime is 11823113. The next prime is 11823139. The reversal of 11823131 is 13132811.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13132811 = 239 ⋅54949.

It is a cyclic number.

It is not a de Polignac number, because 11823131 - 2¹⁴ = 11806747 is a prime.

It is a super-2 number, since 2×11823131² = 279572853286322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11823139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1655 + ... + 5136.

It is an arithmetic number, because the mean of its divisors is an integer number (2957916).

Almost surely, 2^11823131 is an apocalyptic number.

11823131 is a deficient number, since it is larger than the sum of its proper divisors (8533).

11823131 is an equidigital number, since it uses as much as digits as its factorization.

11823131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8532.

The product of its digits is 144, while the sum is 20.

The square root of 11823131 is about 3438.4780063278. The cubic root of 11823131 is about 227.8124740501.

Adding to 11823131 its reverse (13132811), we get a palindrome (24955942).

The spelling of 11823131 in words is "eleven million, eight hundred twenty-three thousand, one hundred thirty-one".