1123213231 has 12 divisors (see below), whose sum is σ = 1323138720. Its totient is φ = 950564160.

The previous prime is 1123213213. The next prime is 1123213237. The reversal of 1123213231 is 1323123211.

It is not a de Polignac number, because 1123213231 - 2⁵ = 1123213199 is a prime.

It is a super-2 number, since 2×1123213231² = 2523215924586918722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1123213199 and 1123213208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123213237) 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, 141210 + ... + 148951.

It is an arithmetic number, because the mean of its divisors is an integer number (110261560).

Almost surely, 2^1123213231 is an apocalyptic number.

1123213231 is a deficient number, since it is larger than the sum of its proper divisors (199925489).

1123213231 is an equidigital number, since it uses as much as digits as its factorization.

1123213231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290254 (or 290247 counting only the distinct ones).

The product of its digits is 216, while the sum is 19.

The square root of 1123213231 is about 33514.3734985454. The cubic root of 1123213231 is about 1039.4910080204.

Adding to 1123213231 its reverse (1323123211), we get a palindrome (2446336442).

The spelling of 1123213231 in words is "one billion, one hundred twenty-three million, two hundred thirteen thousand, two hundred thirty-one".