1089867097089 has 9 divisors (see below), whose sum is σ = 1574256997443. Its totient is φ = 726575976792.

The previous prime is 1089867097087. The next prime is 1089867097117. The reversal of 1089867097089 is 9807907689801.

The square root of 1089867097089 is 1043967.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 990755464689 + 99111632400 = 995367^2 + 314820^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1089867097089 - 2¹ = 1089867097087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1089867097087) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2957907 + ... + 3305895.

Almost surely, 2^{1089867097089} is an apocalyptic number.

1089867097089 is the 1043967-th square number.

1089867097089 is the 521984-th centered octagonal number.

It is an amenable number.

1089867097089 is a deficient number, since it is larger than the sum of its proper divisors (484389900354).

1089867097089 is an frugal number, since it uses more digits than its factorization.

1089867097089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695984 (or 347992 counting only the distinct ones).

The product of its (nonzero) digits is 109734912, while the sum is 72.

The spelling of 1089867097089 in words is "one trillion, eighty-nine billion, eight hundred sixty-seven million, ninety-seven thousand, eighty-nine".