12565601 has 4 divisors (see below), whose sum is σ = 13304772. Its totient is φ = 11826432.

The previous prime is 12565561. The next prime is 12565603. The reversal of 12565601 is 10656521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7507600 + 5058001 = 2740^2 + 2249^2 .

It is a cyclic number.

It is not a de Polignac number, because 12565601 - 2⁶ = 12565537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12565603) 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, 369560 + ... + 369593.

It is an arithmetic number, because the mean of its divisors is an integer number (3326193).

Almost surely, 2^12565601 is an apocalyptic number.

It is an amenable number.

12565601 is a deficient number, since it is larger than the sum of its proper divisors (739171).

12565601 is an equidigital number, since it uses as much as digits as its factorization.

12565601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739170.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 12565601 is about 3544.7991480477. The cubic root of 12565601 is about 232.4847240127.

The spelling of 12565601 in words is "twelve million, five hundred sixty-five thousand, six hundred one".