11532561 has 4 divisors (see below), whose sum is σ = 15376752. Its totient is φ = 7688372.

The previous prime is 11532559. The next prime is 11532569. The reversal of 11532561 is 16523511.

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: 16523511 = 3 ⋅5507837.

It is a cyclic number.

It is not a de Polignac number, because 11532561 - 2¹ = 11532559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11532569) 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, 1922091 + ... + 1922096.

It is an arithmetic number, because the mean of its divisors is an integer number (3844188).

Almost surely, 2^11532561 is an apocalyptic number.

It is an amenable number.

11532561 is a deficient number, since it is larger than the sum of its proper divisors (3844191).

11532561 is an equidigital number, since it uses as much as digits as its factorization.

11532561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3844190.

The product of its digits is 900, while the sum is 24.

The square root of 11532561 is about 3395.9624556229. The cubic root of 11532561 is about 225.9307029036.

The spelling of 11532561 in words is "eleven million, five hundred thirty-two thousand, five hundred sixty-one".