12456561 has 8 divisors (see below), whose sum is σ = 17886400. Its totient is φ = 7665552.

The previous prime is 12456539. The next prime is 12456581. The reversal of 12456561 is 16565421.

12456561 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12456561 - 2⁹ = 12456049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12456581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159661 + ... + 159738.

It is an arithmetic number, because the mean of its divisors is an integer number (2235800).

Almost surely, 2^12456561 is an apocalyptic number.

It is an amenable number.

12456561 is a deficient number, since it is larger than the sum of its proper divisors (5429839).

12456561 is a wasteful number, since it uses less digits than its factorization.

12456561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319415.

The product of its digits is 7200, while the sum is 30.

The square root of 12456561 is about 3529.3853572541. The cubic root of 12456561 is about 231.8102950307.

The spelling of 12456561 in words is "twelve million, four hundred fifty-six thousand, five hundred sixty-one".