11520509 has 32 divisors (see below), whose sum is σ = 16402176. Its totient is φ = 7787520.

The previous prime is 11520473. The next prime is 11520559. The reversal of 11520509 is 90502511.

11520509 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11520509 - 2¹⁶ = 11454973 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11520559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16679 + ... + 17355.

It is an arithmetic number, because the mean of its divisors is an integer number (512568).

Almost surely, 2^11520509 is an apocalyptic number.

It is an amenable number.

11520509 is a deficient number, since it is larger than the sum of its proper divisors (4881667).

11520509 is a wasteful number, since it uses less digits than its factorization.

11520509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 11520509 is about 3394.1875316488. The cubic root of 11520509 is about 225.8519731834.

The spelling of 11520509 in words is "eleven million, five hundred twenty thousand, five hundred nine".