11785521 has 12 divisors (see below), whose sum is σ = 17272976. Its totient is φ = 7142520.

The previous prime is 11785517. The next prime is 11785523. The reversal of 11785521 is 12558711.

11785521 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 11785521 - 2² = 11785517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11785523) 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 11 ways as a sum of consecutive naturals, for example, 15871 + ... + 16596.

Almost surely, 2^11785521 is an apocalyptic number.

11785521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11785521 is a deficient number, since it is larger than the sum of its proper divisors (5487455).

11785521 is a wasteful number, since it uses less digits than its factorization.

11785521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32492 (or 32481 counting only the distinct ones).

The product of its digits is 2800, while the sum is 30.

The square root of 11785521 is about 3433.0046606435. The cubic root of 11785521 is about 227.5706563130.

The spelling of 11785521 in words is "eleven million, seven hundred eighty-five thousand, five hundred twenty-one".