12704561 has 4 divisors (see below), whose sum is σ = 12857712. Its totient is φ = 12551412.

The previous prime is 12704551. The next prime is 12704567. The reversal of 12704561 is 16540721.

12704561 is digitally balanced in base 2, 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12704561 - 2¹⁴ = 12688177 is a prime.

It is a super-2 number, since 2×12704561² = 322811740405442, which contains 22 as substring.

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 12704561.

It is not an unprimeable number, because it can be changed into a prime (12704567) 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, 76451 + ... + 76616.

It is an arithmetic number, because the mean of its divisors is an integer number (3214428).

Almost surely, 2^12704561 is an apocalyptic number.

It is an amenable number.

12704561 is a deficient number, since it is larger than the sum of its proper divisors (153151).

12704561 is an equidigital number, since it uses as much as digits as its factorization.

12704561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153150.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 12704561 is about 3564.3458025281. The cubic root of 12704561 is about 233.3385819681.

The spelling of 12704561 in words is "twelve million, seven hundred four thousand, five hundred sixty-one".