12642517 has 2 divisors, whose sum is σ = 12642518. Its totient is φ = 12642516.

The previous prime is 12642503. The next prime is 12642533. The reversal of 12642517 is 71524621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7584516 + 5058001 = 2754^2 + 2249^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12642517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12642547) 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, 6321258 + 6321259.

It is an arithmetic number, because the mean of its divisors is an integer number (6321259).

Almost surely, 2^12642517 is an apocalyptic number.

It is an amenable number.

12642517 is a deficient number, since it is larger than the sum of its proper divisors (1).

12642517 is an equidigital number, since it uses as much as digits as its factorization.

12642517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 28.

The square root of 12642517 is about 3555.6317300868. The cubic root of 12642517 is about 232.9581178136.

The spelling of 12642517 in words is "twelve million, six hundred forty-two thousand, five hundred seventeen".