1123155312 has 80 divisors (see below), whose sum is σ = 2988371232. Its totient is φ = 363274240.

The previous prime is 1123155301. The next prime is 1123155317. The reversal of 1123155312 is 2135513211.

It is a super-2 number, since 2×1123155312² = 2522955709747634688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123155317) 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 15 ways as a sum of consecutive naturals, for example, 386248 + ... + 389144.

Almost surely, 2^1123155312 is an apocalyptic number.

1123155312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1123155312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1494185616).

1123155312 is an abundant number, since it is smaller than the sum of its proper divisors (1865215920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1123155312 is a wasteful number, since it uses less digits than its factorization.

1123155312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3146 (or 3140 counting only the distinct ones).

The product of its digits is 900, while the sum is 24.

The square root of 1123155312 is about 33513.5093954662. The cubic root of 1123155312 is about 1039.4731404381.

Adding to 1123155312 its reverse (2135513211), we get a palindrome (3258668523).

The spelling of 1123155312 in words is "one billion, one hundred twenty-three million, one hundred fifty-five thousand, three hundred twelve".