1155172256 has 36 divisors (see below), whose sum is σ = 2645554338. Its totient is φ = 495073152.

The previous prime is 1155172247. The next prime is 1155172261. The reversal of 1155172256 is 6522715511.

It can be written as a sum of positive squares in only one way, i.e., 1027843600 + 127328656 = 32060^2 + 11284^2 .

It is an unprimeable number.

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, 366791 + ... + 369926.

Almost surely, 2^1155172256 is an apocalyptic number.

1155172256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1155172256 is an abundant number, since it is smaller than the sum of its proper divisors (1490382082).

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

1155172256 is an equidigital number, since it uses as much as digits as its factorization.

1155172256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736741 (or 736726 counting only the distinct ones).

The product of its digits is 21000, while the sum is 35.

The square root of 1155172256 is about 33987.8251142964. The cubic root of 1155172256 is about 1049.2579052726.

Adding to 1155172256 its reverse (6522715511), we get a palindrome (7677887767).

The spelling of 1155172256 in words is "one billion, one hundred fifty-five million, one hundred seventy-two thousand, two hundred fifty-six".