1123131111 has 12 divisors (see below), whose sum is σ = 1550930472. Its totient is φ = 722933344.

The previous prime is 1123131103. The next prime is 1123131127. The reversal of 1123131111 is 1111313211.

It is not a de Polignac number, because 1123131111 - 2³ = 1123131103 is a prime.

It is a super-2 number, since 2×1123131111² = 2522846984992188642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123131131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 220056 + ... + 225101.

It is an arithmetic number, because the mean of its divisors is an integer number (129244206).

Almost surely, 2^1123131111 is an apocalyptic number.

1123131111 is a deficient number, since it is larger than the sum of its proper divisors (427799361).

1123131111 is an equidigital number, since it uses as much as digits as its factorization.

1123131111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445218 (or 445189 counting only the distinct ones).

The product of its digits is 18, while the sum is 15.

The square root of 1123131111 is about 33513.1483301704. The cubic root of 1123131111 is about 1039.4656744270.

Adding to 1123131111 its reverse (1111313211), we get a palindrome (2234444322).

The spelling of 1123131111 in words is "one billion, one hundred twenty-three million, one hundred thirty-one thousand, one hundred eleven".