1131265656 has 64 divisors (see below), whose sum is σ = 3171300000. Its totient is φ = 373621248.

The previous prime is 1131265633. The next prime is 1131265657. The reversal of 1131265656 is 6565621311.

It is a super-2 number, since 2×1131265656² = 2559523968890220672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1131265656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131265657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 481 + ... + 47568.

Almost surely, 2^1131265656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1131265656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1585650000).

1131265656 is an abundant number, since it is smaller than the sum of its proper divisors (2040034344).

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

1131265656 is a wasteful number, since it uses less digits than its factorization.

1131265656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48173 (or 48163 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 1131265656 is about 33634.2928571421. The cubic root of 1131265656 is about 1041.9691661135.

Adding to 1131265656 its reverse (6565621311), we get a palindrome (7696886967).

The spelling of 1131265656 in words is "one billion, one hundred thirty-one million, two hundred sixty-five thousand, six hundred fifty-six".