1123231131 has 20 divisors (see below), whose sum is σ = 1830452184. Its totient is φ = 680745600.

The previous prime is 1123231129. The next prime is 1123231139. The reversal of 1123231131 is 1311323211.

1123231131 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1123231131 - 2¹ = 1123231129 is a prime.

It is a super-2 number, since 2×1123231131² = 2523296347295078322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1123231139) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 629430 + ... + 631211.

Almost surely, 2^1123231131 is an apocalyptic number.

1123231131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1123231131 is a deficient number, since it is larger than the sum of its proper divisors (707221053).

1123231131 is a wasteful number, since it uses less digits than its factorization.

1123231131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260664 (or 1260655 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1123231131 is about 33514.6405470803. The cubic root of 1123231131 is about 1039.4965299135.

Adding to 1123231131 its reverse (1311323211), we get a palindrome (2434554342).

The spelling of 1123231131 in words is "one billion, one hundred twenty-three million, two hundred thirty-one thousand, one hundred thirty-one".