1191088656 has 60 divisors (see below), whose sum is σ = 3336453120. Its totient is φ = 396665280.

The previous prime is 1191088651. The next prime is 1191088669. The reversal of 1191088656 is 6568801911.

It is not an unprimeable number, because it can be changed into a prime (1191088651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186801 + ... + 193071.

It is an arithmetic number, because the mean of its divisors is an integer number (55607552).

Almost surely, 2^1191088656 is an apocalyptic number.

1191088656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1191088656 is an abundant number, since it is smaller than the sum of its proper divisors (2145364464).

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

1191088656 is a wasteful number, since it uses less digits than its factorization.

1191088656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7604 (or 7595 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 1191088656 is about 34512.1522945179. The cubic root of 1191088656 is about 1060.0215540888.

The spelling of 1191088656 in words is "one billion, one hundred ninety-one million, eighty-eight thousand, six hundred fifty-six".