11528561 has 4 divisors (see below), whose sum is σ = 12576624. Its totient is φ = 10480500.

The previous prime is 11528537. The next prime is 11528563. The reversal of 11528561 is 16582511.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16582511 = 11 ⋅1507501.

It is a cyclic number.

It is not a de Polignac number, because 11528561 - 2¹⁴ = 11512177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11528563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 524015 + ... + 524036.

It is an arithmetic number, because the mean of its divisors is an integer number (3144156).

Almost surely, 2^11528561 is an apocalyptic number.

11528561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11528561 is a deficient number, since it is larger than the sum of its proper divisors (1048063).

11528561 is a wasteful number, since it uses less digits than its factorization.

11528561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048062.

The product of its digits is 2400, while the sum is 29.

The square root of 11528561 is about 3395.3734698852. The cubic root of 11528561 is about 225.9045789775.

The spelling of 11528561 in words is "eleven million, five hundred twenty-eight thousand, five hundred sixty-one".