12511865 has 4 divisors (see below), whose sum is σ = 15014244. Its totient is φ = 10009488.

The previous prime is 12511859. The next prime is 12511871. The reversal of 12511865 is 56811521.

12511865 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (12511859) and next prime (12511871).

It can be written as a sum of positive squares in 2 ways, for example, as 7458361 + 5053504 = 2731^2 + 2248^2 .

It is a cyclic number.

It is not a de Polignac number, because 12511865 - 2¹² = 12507769 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1251182 + ... + 1251191.

It is an arithmetic number, because the mean of its divisors is an integer number (3753561).

Almost surely, 2^12511865 is an apocalyptic number.

It is an amenable number.

12511865 is a deficient number, since it is larger than the sum of its proper divisors (2502379).

12511865 is an equidigital number, since it uses as much as digits as its factorization.

12511865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2502378.

The product of its digits is 2400, while the sum is 29.

The square root of 12511865 is about 3537.2114723324. The cubic root of 12511865 is about 232.1528483950.

The spelling of 12511865 in words is "twelve million, five hundred eleven thousand, eight hundred sixty-five".