1123311231 has 72 divisors (see below), whose sum is σ = 1984801104. Its totient is φ = 609638400.

The previous prime is 1123311223. The next prime is 1123311239. The reversal of 1123311231 is 1321133211.

1123311231 is a `hidden beast` number, since 1 + 123 + 311 + 231 = 666.

It is an interprime number because it is at equal distance from previous prime (1123311223) and next prime (1123311239).

It is not a de Polignac number, because 1123311231 - 2³ = 1123311223 is a prime.

It is a super-2 number, since 2×1123311231² = 2523656243381470722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123311239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 700831 + ... + 702431.

It is an arithmetic number, because the mean of its divisors is an integer number (27566682).

Almost surely, 2^1123311231 is an apocalyptic number.

1123311231 is a deficient number, since it is larger than the sum of its proper divisors (861489873).

1123311231 is a wasteful number, since it uses less digits than its factorization.

1123311231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701 (or 1691 counting only the distinct ones).

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

The square root of 1123311231 is about 33515.8355259122. The cubic root of 1123311231 is about 1039.5212388954.

Adding to 1123311231 its reverse (1321133211), we get a palindrome (2444444442).

The spelling of 1123311231 in words is "one billion, one hundred twenty-three million, three hundred eleven thousand, two hundred thirty-one".