1161331056 has 30 divisors (see below), whose sum is σ = 3250114400. Its totient is φ = 387110304.

The previous prime is 1161331051. The next prime is 1161331069. The reversal of 1161331056 is 6501331611.

1161331056 is a `hidden beast` number, since 11 + 613 + 31 + 0 + 5 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161331051) 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 5 ways as a sum of consecutive naturals, for example, 4032256 + ... + 4032543.

Almost surely, 2^1161331056 is an apocalyptic number.

1161331056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1161331056 is an abundant number, since it is smaller than the sum of its proper divisors (2088783344).

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

1161331056 is a wasteful number, since it uses less digits than its factorization.

1161331056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8064813 (or 8064804 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 1161331056 is about 34078.3077044621. The cubic root of 1161331056 is about 1051.1193070674.

Adding to 1161331056 its reverse (6501331611), we get a palindrome (7662662667).

The spelling of 1161331056 in words is "one billion, one hundred sixty-one million, three hundred thirty-one thousand, fifty-six".