12643513 has 2 divisors, whose sum is σ = 12643514. Its totient is φ = 12643512.

The previous prime is 12643511. The next prime is 12643541. The reversal of 12643513 is 31534621.

12643513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7683984 + 4959529 = 2772^2 + 2227^2 .

It is a cyclic number.

It is not a de Polignac number, because 12643513 - 2¹ = 12643511 is a prime.

Together with 12643511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12643511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6321756 + 6321757.

It is an arithmetic number, because the mean of its divisors is an integer number (6321757).

Almost surely, 2^12643513 is an apocalyptic number.

It is an amenable number.

12643513 is a deficient number, since it is larger than the sum of its proper divisors (1).

12643513 is an equidigital number, since it uses as much as digits as its factorization.

12643513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 25.

The square root of 12643513 is about 3555.7717868277. The cubic root of 12643513 is about 232.9642352714.

The spelling of 12643513 in words is "twelve million, six hundred forty-three thousand, five hundred thirteen".