11087988891 has 16 divisors (see below), whose sum is σ = 17441015808. Its totient is φ = 6131606400.

The previous prime is 11087988853. The next prime is 11087988893. The reversal of 11087988891 is 19888978011.

It is not a de Polignac number, because 11087988891 - 2⁷ = 11087988763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11087988893) 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, 8515470 + ... + 8516771.

It is an arithmetic number, because the mean of its divisors is an integer number (1090063488).

Almost surely, 2^11087988891 is an apocalyptic number.

11087988891 is a deficient number, since it is larger than the sum of its proper divisors (6353026917).

11087988891 is a wasteful number, since it uses less digits than its factorization.

11087988891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17032282.

The product of its (nonzero) digits is 2322432, while the sum is 60.

The spelling of 11087988891 in words is "eleven billion, eighty-seven million, nine hundred eighty-eight thousand, eight hundred ninety-one".