1123331231 has 4 divisors (see below), whose sum is σ = 1225452264. Its totient is φ = 1021210200.

The previous prime is 1123331207. The next prime is 1123331273. The reversal of 1123331231 is 1321333211.

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 1123331231 - 2¹⁰ = 1123330207 is a prime.

It is a super-2 number, since 2×1123331231² = 2523746109079950722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123333231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51060500 + ... + 51060521.

It is an arithmetic number, because the mean of its divisors is an integer number (306363066).

Almost surely, 2^1123331231 is an apocalyptic number.

1123331231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1123331231 is a deficient number, since it is larger than the sum of its proper divisors (102121033).

1123331231 is a wasteful number, since it uses less digits than its factorization.

1123331231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102121032.

The product of its digits is 324, while the sum is 20.

The square root of 1123331231 is about 33516.1338910084. The cubic root of 1123331231 is about 1039.5274082457.

Adding to 1123331231 its reverse (1321333211), we get a palindrome (2444664442).

The spelling of 1123331231 in words is "one billion, one hundred twenty-three million, three hundred thirty-one thousand, two hundred thirty-one".