12605651 has 4 divisors (see below), whose sum is σ = 12613152. Its totient is φ = 12598152.

The previous prime is 12605647. The next prime is 12605657. The reversal of 12605651 is 15650621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 15650621 = 7 ⋅2235803.

It is a cyclic number.

It is not a de Polignac number, because 12605651 - 2² = 12605647 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 12605651.

It is not an unprimeable number, because it can be changed into a prime (12605657) 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, 65 + ... + 5021.

It is an arithmetic number, because the mean of its divisors is an integer number (3153288).

Almost surely, 2^12605651 is an apocalyptic number.

12605651 is a deficient number, since it is larger than the sum of its proper divisors (7501).

12605651 is an equidigital number, since it uses as much as digits as its factorization.

12605651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7500.

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

The square root of 12605651 is about 3550.4437750794. The cubic root of 12605651 is about 232.7314594833.

The spelling of 12605651 in words is "twelve million, six hundred five thousand, six hundred fifty-one".