12725561 has 2 divisors, whose sum is σ = 12725562. Its totient is φ = 12725560.

The previous prime is 12725551. The next prime is 12725563. The reversal of 12725561 is 16552721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8231161 + 4494400 = 2869^2 + 2120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12725561 is a prime.

It is a Sophie Germain prime.

Together with 12725563, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12725563) 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, 6362780 + 6362781.

It is an arithmetic number, because the mean of its divisors is an integer number (6362781).

Almost surely, 2^12725561 is an apocalyptic number.

It is an amenable number.

12725561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12725561 is an equidigital number, since it uses as much as digits as its factorization.

12725561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4200, while the sum is 29.

The square root of 12725561 is about 3567.2904283223. The cubic root of 12725561 is about 233.4670768401.

The spelling of 12725561 in words is "twelve million, seven hundred twenty-five thousand, five hundred sixty-one".