12535561 has 8 divisors (see below), whose sum is σ = 12889800. Its totient is φ = 12186240.

The previous prime is 12535559. The next prime is 12535577. The reversal of 12535561 is 16553521.

It can be written as a sum of positive squares in 4 ways, for example, as 145161 + 12390400 = 381^2 + 3520^2 .

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 12535561 - 2¹ = 12535559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12535531) 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, 4275 + ... + 6583.

It is an arithmetic number, because the mean of its divisors is an integer number (1611225).

Almost surely, 2^12535561 is an apocalyptic number.

It is an amenable number.

12535561 is a deficient number, since it is larger than the sum of its proper divisors (354239).

12535561 is an equidigital number, since it uses as much as digits as its factorization.

12535561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2459.

The product of its digits is 4500, while the sum is 28.

The square root of 12535561 is about 3540.5594190749. The cubic root of 12535561 is about 232.2993126974.

The spelling of 12535561 in words is "twelve million, five hundred thirty-five thousand, five hundred sixty-one".