11504561 has 4 divisors (see below), whose sum is σ = 11901300. Its totient is φ = 11107824.

The previous prime is 11504543. The next prime is 11504573. The reversal of 11504561 is 16540511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16540511 = 13 ⋅1272347.

It can be written as a sum of positive squares in 2 ways, for example, as 8814961 + 2689600 = 2969^2 + 1640^2 .

It is a cyclic number.

It is not a de Polignac number, because 11504561 - 2⁶ = 11504497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11504501) 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, 198326 + ... + 198383.

It is an arithmetic number, because the mean of its divisors is an integer number (2975325).

Almost surely, 2^11504561 is an apocalyptic number.

It is an amenable number.

11504561 is a deficient number, since it is larger than the sum of its proper divisors (396739).

11504561 is an equidigital number, since it uses as much as digits as its factorization.

11504561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396738.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 11504561 is about 3391.8374076597. The cubic root of 11504561 is about 225.7477083865.

The spelling of 11504561 in words is "eleven million, five hundred four thousand, five hundred sixty-one".