1155123256 has 24 divisors (see below), whose sum is σ = 2519466120. Its totient is φ = 495052656.

The previous prime is 1155123253. The next prime is 1155123269. The reversal of 1155123256 is 6523215511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155123253) 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 5 ways as a sum of consecutive naturals, for example, 1472980 + ... + 1473763.

It is an arithmetic number, because the mean of its divisors is an integer number (104977755).

Almost surely, 2^1155123256 is an apocalyptic number.

It is an amenable number.

1155123256 is an abundant number, since it is smaller than the sum of its proper divisors (1364342864).

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

1155123256 is a wasteful number, since it uses less digits than its factorization.

1155123256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2946763 (or 2946752 counting only the distinct ones).

The product of its digits is 9000, while the sum is 31.

The square root of 1155123256 is about 33987.1042602926. The cubic root of 1155123256 is about 1049.2430692849.

Adding to 1155123256 its reverse (6523215511), we get a palindrome (7678338767).

The spelling of 1155123256 in words is "one billion, one hundred fifty-five million, one hundred twenty-three thousand, two hundred fifty-six".