1123201128 has 48 divisors (see below), whose sum is σ = 3266455680. Its totient is φ = 320914272.

The previous prime is 1123201127. The next prime is 1123201133. The reversal of 1123201128 is 8211023211.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1123201127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 476376 + ... + 478727.

It is an arithmetic number, because the mean of its divisors is an integer number (68051160).

Almost surely, 2^1123201128 is an apocalyptic number.

It is an amenable number.

1123201128 is an abundant number, since it is smaller than the sum of its proper divisors (2143254552).

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

1123201128 is a wasteful number, since it uses less digits than its factorization.

1123201128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955126 (or 955115 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 1123201128 is about 33514.1929337408. The cubic root of 1123201128 is about 1039.4872743854.

Adding to 1123201128 its reverse (8211023211), we get a palindrome (9334224339).

The spelling of 1123201128 in words is "one billion, one hundred twenty-three million, two hundred one thousand, one hundred twenty-eight".