13512561 has 4 divisors (see below), whose sum is σ = 18016752. Its totient is φ = 9008372.

The previous prime is 13512539. The next prime is 13512571. The reversal of 13512561 is 16521531.

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.

It is a cyclic number.

It is not a de Polignac number, because 13512561 - 2¹⁹ = 12988273 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13512571) 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, 2252091 + ... + 2252096.

It is an arithmetic number, because the mean of its divisors is an integer number (4504188).

Almost surely, 2^13512561 is an apocalyptic number.

It is an amenable number.

13512561 is a deficient number, since it is larger than the sum of its proper divisors (4504191).

13512561 is an equidigital number, since it uses as much as digits as its factorization.

13512561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4504190.

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

The square root of 13512561 is about 3675.9435523414. The cubic root of 13512561 is about 238.1839843273.

The spelling of 13512561 in words is "thirteen million, five hundred twelve thousand, five hundred sixty-one".