10991089 has 2 divisors, whose sum is σ = 10991090. Its totient is φ = 10991088.

The previous prime is 10991077. The next prime is 10991107. The reversal of 10991089 is 98019901.

10991089 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7246864 + 3744225 = 2692^2 + 1935^2 .

It is a cyclic number.

It is not a de Polignac number, because 10991089 - 2¹⁹ = 10466801 is a prime.

It is not a weakly prime, because it can be changed into another prime (10991059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5495544 + 5495545.

It is an arithmetic number, because the mean of its divisors is an integer number (5495545).

Almost surely, 2^10991089 is an apocalyptic number.

It is an amenable number.

10991089 is a deficient number, since it is larger than the sum of its proper divisors (1).

10991089 is an equidigital number, since it uses as much as digits as its factorization.

10991089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 10991089 is about 3315.2811343836. The cubic root of 10991089 is about 222.3379386314.

The spelling of 10991089 in words is "ten million, nine hundred ninety-one thousand, eighty-nine".