11089656891 has 16 divisors (see below), whose sum is σ = 16558489600. Its totient is φ = 7334888904.

The previous prime is 11089656887. The next prime is 11089656901. The reversal of 11089656891 is 19865698011.

It is not a de Polignac number, because 11089656891 - 2² = 11089656887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11089656191) 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, 1613611 + ... + 1620468.

It is an arithmetic number, because the mean of its divisors is an integer number (1034905600).

Almost surely, 2^11089656891 is an apocalyptic number.

11089656891 is a deficient number, since it is larger than the sum of its proper divisors (5468832709).

11089656891 is a wasteful number, since it uses less digits than its factorization.

11089656891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3234215 (or 3234209 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 54.

The spelling of 11089656891 in words is "eleven billion, eighty-nine million, six hundred fifty-six thousand, eight hundred ninety-one".