11640521 has 8 divisors (see below), whose sum is σ = 12427200. Its totient is φ = 10871280.

The previous prime is 11640511. The next prime is 11640527. The reversal of 11640521 is 12504611.

11640521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11640521 - 2⁶ = 11640457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11640493 and 11640502.

It is not an unprimeable number, because it can be changed into a prime (11640527) 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 7 ways as a sum of consecutive naturals, for example, 2966 + ... + 5663.

It is an arithmetic number, because the mean of its divisors is an integer number (1553400).

Almost surely, 2^11640521 is an apocalyptic number.

It is an amenable number.

11640521 is a deficient number, since it is larger than the sum of its proper divisors (786679).

11640521 is an equidigital number, since it uses as much as digits as its factorization.

11640521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8719.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 11640521 is about 3411.8207748942. The cubic root of 11640521 is about 226.6335175956.

The spelling of 11640521 in words is "eleven million, six hundred forty thousand, five hundred twenty-one".