11288909 has 4 divisors (see below), whose sum is σ = 11295804. Its totient is φ = 11282016.

The previous prime is 11288887. The next prime is 11288923. The reversal of 11288909 is 90988211.

11288909 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90988211 = 67 ⋅1358033.

It can be written as a sum of positive squares in 2 ways, for example, as 4502884 + 6786025 = 2122^2 + 2605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11288909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11288999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569 + ... + 4785.

It is an arithmetic number, because the mean of its divisors is an integer number (2823951).

Almost surely, 2^11288909 is an apocalyptic number.

It is an amenable number.

11288909 is a deficient number, since it is larger than the sum of its proper divisors (6895).

11288909 is an equidigital number, since it uses as much as digits as its factorization.

11288909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6894.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 11288909 is about 3359.8971710456. The cubic root of 11288909 is about 224.3282615383.

The spelling of 11288909 in words is "eleven million, two hundred eighty-eight thousand, nine hundred nine".