1131806256 has 80 divisors (see below), whose sum is σ = 3349142784. Its totient is φ = 322636032.

The previous prime is 1131806237. The next prime is 1131806257. The reversal of 1131806256 is 6526081311.

It is a super-2 number, since 2×1131806256² = 2561970802241475072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1131806257) 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, 153306 + ... + 160518.

Almost surely, 2^1131806256 is an apocalyptic number.

1131806256 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 1131806256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1674571392).

1131806256 is an abundant number, since it is smaller than the sum of its proper divisors (2217336528).

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

1131806256 is a wasteful number, since it uses less digits than its factorization.

1131806256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7698 (or 7692 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 1131806256 is about 33642.3283379733. The cubic root of 1131806256 is about 1042.1351155894.

Adding to 1131806256 its reverse (6526081311), we get a palindrome (7657887567).

The spelling of 1131806256 in words is "one billion, one hundred thirty-one million, eight hundred six thousand, two hundred fifty-six".