12871565 has 24 divisors (see below), whose sum is σ = 18172512. Its totient is φ = 8725920.

The previous prime is 12871543. The next prime is 12871583. The reversal of 12871565 is 56517821.

12871565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12871565 - 2⁶ = 12871501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25970 + ... + 26460.

It is an arithmetic number, because the mean of its divisors is an integer number (757188).

Almost surely, 2^12871565 is an apocalyptic number.

It is an amenable number.

12871565 is a deficient number, since it is larger than the sum of its proper divisors (5300947).

12871565 is a wasteful number, since it uses less digits than its factorization.

12871565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617 (or 610 counting only the distinct ones).

The product of its digits is 16800, while the sum is 35.

The square root of 12871565 is about 3587.6963360909. The cubic root of 12871565 is about 234.3565618680.

The spelling of 12871565 in words is "twelve million, eight hundred seventy-one thousand, five hundred sixty-five".