12456581 has 2 divisors, whose sum is σ = 12456582. Its totient is φ = 12456580.

The previous prime is 12456539. The next prime is 12456649. The reversal of 12456581 is 18565421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11792356 + 664225 = 3434^2 + 815^2 .

It is a cyclic number.

It is not a de Polignac number, because 12456581 - 2⁶ = 12456517 is a prime.

It is a super-2 number, since 2×12456581² = 310332820419122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12456281) 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 as a sum of consecutive naturals, namely, 6228290 + 6228291.

It is an arithmetic number, because the mean of its divisors is an integer number (6228291).

Almost surely, 2^12456581 is an apocalyptic number.

It is an amenable number.

12456581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12456581 is an equidigital number, since it uses as much as digits as its factorization.

12456581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9600, while the sum is 32.

The square root of 12456581 is about 3529.3881906075. The cubic root of 12456581 is about 231.8104190939.

The spelling of 12456581 in words is "twelve million, four hundred fifty-six thousand, five hundred eighty-one".