12456521 has 8 divisors (see below), whose sum is σ = 15530304. Its totient is φ = 9706320.

The previous prime is 12456517. The next prime is 12456527. The reversal of 12456521 is 12565421.

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

It is a cyclic number.

It is not a de Polignac number, because 12456521 - 2² = 12456517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12456527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80810 + ... + 80963.

It is an arithmetic number, because the mean of its divisors is an integer number (1941288).

Almost surely, 2^12456521 is an apocalyptic number.

12456521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12456521 is a deficient number, since it is larger than the sum of its proper divisors (3073783).

12456521 is a wasteful number, since it uses less digits than its factorization.

12456521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161791.

The product of its digits is 2400, while the sum is 26.

The square root of 12456521 is about 3529.3796905405. The cubic root of 12456521 is about 231.8100469038.

Subtracting 12456521 from its reverse (12565421), we obtain a square (108900 = 330²).

It can be divided in two parts, 12 and 456521, that added together give a cube (456533 = 77³).

The spelling of 12456521 in words is "twelve million, four hundred fifty-six thousand, five hundred twenty-one".