1155156256 has 48 divisors (see below), whose sum is σ = 2413678176. Its totient is φ = 542319616.

The previous prime is 1155156251. The next prime is 1155156283. The reversal of 1155156256 is 6526515511.

It is not an unprimeable number, because it can be changed into a prime (1155156251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251775 + ... + 256321.

It is an arithmetic number, because the mean of its divisors is an integer number (50284962).

Almost surely, 2^1155156256 is an apocalyptic number.

1155156256 is a gapful number since it is divisible by the number (16) 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 1155156256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1206839088).

1155156256 is an abundant number, since it is smaller than the sum of its proper divisors (1258521920).

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

1155156256 is a wasteful number, since it uses less digits than its factorization.

1155156256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041 (or 5033 counting only the distinct ones).

The product of its digits is 45000, while the sum is 37.

The square root of 1155156256 is about 33987.5897350783. The cubic root of 1155156256 is about 1049.2530609146.

It can be divided in two parts, 115515 and 6256, that added together give a triangular number (121771 = T₄₉₃).

The spelling of 1155156256 in words is "one billion, one hundred fifty-five million, one hundred fifty-six thousand, two hundred fifty-six".