1191043056 has 80 divisors (see below), whose sum is σ = 3574120448. Its totient is φ = 334713600.

The previous prime is 1191043043. The next prime is 1191043081. The reversal of 1191043056 is 6503401911.

It is a super-2 number, since 2×1191043056² = 2837167122491638272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8560 + ... + 49551.

Almost surely, 2^1191043056 is an apocalyptic number.

1191043056 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 1191043056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1787060224).

1191043056 is an abundant number, since it is smaller than the sum of its proper divisors (2383077392).

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

1191043056 is a wasteful number, since it uses less digits than its factorization.

1191043056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58190 (or 58184 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 1191043056 is about 34511.4916513326. The cubic root of 1191043056 is about 1060.0080265204.

Adding to 1191043056 its reverse (6503401911), we get a palindrome (7694444967).

The spelling of 1191043056 in words is "one billion, one hundred ninety-one million, forty-three thousand, fifty-six".