1089605889 has 12 divisors (see below), whose sum is σ = 1575549456. Its totient is φ = 725631192.

The previous prime is 1089605861. The next prime is 1089605903. The reversal of 1089605889 is 9885069801.

It is not a de Polignac number, because 1089605889 - 2²⁵ = 1056051457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1089605819) 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, 55399 + ... + 72444.

It is an arithmetic number, because the mean of its divisors is an integer number (131295788).

Almost surely, 2^1089605889 is an apocalyptic number.

It is an amenable number.

1089605889 is a deficient number, since it is larger than the sum of its proper divisors (485943567).

1089605889 is a wasteful number, since it uses less digits than its factorization.

1089605889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128796 (or 128793 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The square root of 1089605889 is about 33009.1788598262. The cubic root of 1089605889 is about 1029.0184160332.

The spelling of 1089605889 in words is "one billion, eighty-nine million, six hundred five thousand, eight hundred eighty-nine".