11520553 has 4 divisors (see below), whose sum is σ = 12567888. Its totient is φ = 10473220.

The previous prime is 11520473. The next prime is 11520559. The reversal of 11520553 is 35502511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11520553 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 523651 + ... + 523672.

It is an arithmetic number, because the mean of its divisors is an integer number (3141972).

Almost surely, 2^11520553 is an apocalyptic number.

It is an amenable number.

11520553 is a deficient number, since it is larger than the sum of its proper divisors (1047335).

11520553 is a wasteful number, since it uses less digits than its factorization.

11520553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047334.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 11520553 is about 3394.1940133116. The cubic root of 11520553 is about 225.8522607134.

The spelling of 11520553 in words is "eleven million, five hundred twenty thousand, five hundred fifty-three".