1191541056 has 28 divisors (see below), whose sum is σ = 3152619552. Its totient is φ = 397180288.

The previous prime is 1191541031. The next prime is 1191541069. The reversal of 1191541056 is 6501451911.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3102780 + ... + 3103163.

Almost surely, 2^1191541056 is an apocalyptic number.

1191541056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1191541056 is an abundant number, since it is smaller than the sum of its proper divisors (1961078496).

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

1191541056 is an equidigital number, since it uses as much as digits as its factorization.

1191541056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6205958 (or 6205948 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 33.

The square root of 1191541056 is about 34518.7058853602. The cubic root of 1191541056 is about 1060.1557431062.

Adding to 1191541056 its reverse (6501451911), we get a palindrome (7692992967).

The spelling of 1191541056 in words is "one billion, one hundred ninety-one million, five hundred forty-one thousand, fifty-six".