11644521 has 16 divisors (see below), whose sum is σ = 17971200. Its totient is φ = 6568848.

The previous prime is 11644519. The next prime is 11644531. The reversal of 11644521 is 12544611.

It is a happy number.

It is not a de Polignac number, because 11644521 - 2¹ = 11644519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11644491 and 11644500.

It is not an unprimeable number, because it can be changed into a prime (11644531) 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 15 ways as a sum of consecutive naturals, for example, 1851 + ... + 5168.

It is an arithmetic number, because the mean of its divisors is an integer number (1123200).

Almost surely, 2^11644521 is an apocalyptic number.

It is an amenable number.

11644521 is a deficient number, since it is larger than the sum of its proper divisors (6326679).

11644521 is an equidigital number, since it uses as much as digits as its factorization.

11644521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7108.

The product of its digits is 960, while the sum is 24.

The square root of 11644521 is about 3412.4069218075. The cubic root of 11644521 is about 226.6594737721.

The spelling of 11644521 in words is "eleven million, six hundred forty-four thousand, five hundred twenty-one".