1123211231 has 4 divisors (see below), whose sum is σ = 1124245632. Its totient is φ = 1122176832.

The previous prime is 1123211191. The next prime is 1123211237. The reversal of 1123211231 is 1321123211.

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 1123211231 - 2¹⁴ = 1123194847 is a prime.

It is a super-2 number, since 2×1123211231² = 2523206938889070722, 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 (1123211237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515570 + ... + 517743.

It is an arithmetic number, because the mean of its divisors is an integer number (281061408).

Almost surely, 2^1123211231 is an apocalyptic number.

1123211231 is a deficient number, since it is larger than the sum of its proper divisors (1034401).

1123211231 is a wasteful number, since it uses less digits than its factorization.

1123211231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034400.

The product of its digits is 72, while the sum is 17.

The square root of 1123211231 is about 33514.3436605881. The cubic root of 1123211231 is about 1039.4903910455.

Adding to 1123211231 its reverse (1321123211), we get a palindrome (2444334442).

The spelling of 1123211231 in words is "one billion, one hundred twenty-three million, two hundred eleven thousand, two hundred thirty-one".