12565523 has 4 divisors (see below), whose sum is σ = 12585768. Its totient is φ = 12545280.

The previous prime is 12565519. The next prime is 12565537. The reversal of 12565523 is 32556521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32556521 = 2503 ⋅13007.

It is a cyclic number.

It is not a de Polignac number, because 12565523 - 2² = 12565519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12565513) 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, 9161 + ... + 10442.

It is an arithmetic number, because the mean of its divisors is an integer number (3146442).

Almost surely, 2^12565523 is an apocalyptic number.

12565523 is a deficient number, since it is larger than the sum of its proper divisors (20245).

12565523 is an equidigital number, since it uses as much as digits as its factorization.

12565523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20244.

The product of its digits is 9000, while the sum is 29.

The square root of 12565523 is about 3544.7881459969. The cubic root of 12565523 is about 232.4842429681.

The spelling of 12565523 in words is "twelve million, five hundred sixty-five thousand, five hundred twenty-three".