12656081 has 2 divisors, whose sum is σ = 12656082. Its totient is φ = 12656080.

The previous prime is 12656069. The next prime is 12656087. The reversal of 12656081 is 18065621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7203856 + 5452225 = 2684^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 12656081 - 2¹⁸ = 12393937 is a prime.

It is a super-2 number, since 2×12656081² = 320352772557122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12656087) 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, 6328040 + 6328041.

It is an arithmetic number, because the mean of its divisors is an integer number (6328041).

Almost surely, 2^12656081 is an apocalyptic number.

It is an amenable number.

12656081 is a deficient number, since it is larger than the sum of its proper divisors (1).

12656081 is an equidigital number, since it uses as much as digits as its factorization.

12656081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 12656081 is about 3557.5386153913. The cubic root of 12656081 is about 233.0414006633.

The spelling of 12656081 in words is "twelve million, six hundred fifty-six thousand, eighty-one".