11561089 has 2 divisors, whose sum is σ = 11561090. Its totient is φ = 11561088.

The previous prime is 11561087. The next prime is 11561117. The reversal of 11561089 is 98016511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11560000 + 1089 = 3400^2 + 33^2 .

It is a cyclic number.

It is not a de Polignac number, because 11561089 - 2¹ = 11561087 is a prime.

Together with 11561087, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11561089.

It is not a weakly prime, because it can be changed into another prime (11561087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5780544 + 5780545.

It is an arithmetic number, because the mean of its divisors is an integer number (5780545).

Almost surely, 2^11561089 is an apocalyptic number.

It is an amenable number.

11561089 is a deficient number, since it is larger than the sum of its proper divisors (1).

11561089 is an equidigital number, since it uses as much as digits as its factorization.

11561089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 11561089 is about 3400.1601432874. The cubic root of 11561089 is about 226.1168438016.

It can be divided in two parts, 1156 and 1089, that multiplied together give a square (1258884 = 1122²).

The spelling of 11561089 in words is "eleven million, five hundred sixty-one thousand, eighty-nine".