12651865 has 4 divisors (see below), whose sum is σ = 15182244. Its totient is φ = 10121488.

The previous prime is 12651857. The next prime is 12651871. The reversal of 12651865 is 56815621.

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: 56815621 = 47 ⋅1208843.

It can be written as a sum of positive squares in 2 ways, for example, as 2985984 + 9665881 = 1728^2 + 3109^2 .

It is a cyclic number.

It is not a de Polignac number, because 12651865 - 2³ = 12651857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12651865.

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, 1265182 + ... + 1265191.

It is an arithmetic number, because the mean of its divisors is an integer number (3795561).

Almost surely, 2^12651865 is an apocalyptic number.

It is an amenable number.

12651865 is a deficient number, since it is larger than the sum of its proper divisors (2530379).

12651865 is an equidigital number, since it uses as much as digits as its factorization.

12651865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2530378.

The product of its digits is 14400, while the sum is 34.

The square root of 12651865 is about 3556.9460215190. The cubic root of 12651865 is about 233.0155208336.

The spelling of 12651865 in words is "twelve million, six hundred fifty-one thousand, eight hundred sixty-five".