1089888891 has 32 divisors (see below), whose sum is σ = 1817883648. Its totient is φ = 565453440.

The previous prime is 1089888889. The next prime is 1089888901. The reversal of 1089888891 is 1988889801.

1089888891 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1089888891 - 2¹ = 1089888889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1089888871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16071 + ... + 49376.

It is an arithmetic number, because the mean of its divisors is an integer number (56808864).

Almost surely, 2^1089888891 is an apocalyptic number.

1089888891 is a deficient number, since it is larger than the sum of its proper divisors (727994757).

1089888891 is a wasteful number, since it uses less digits than its factorization.

1089888891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65531.

The product of its (nonzero) digits is 2654208, while the sum is 60.

The square root of 1089888891 is about 33013.4652982688. The cubic root of 1089888891 is about 1029.1074968847.

The spelling of 1089888891 in words is "one billion, eighty-nine million, eight hundred eighty-eight thousand, eight hundred ninety-one".