12920647 has 2 divisors, whose sum is σ = 12920648. Its totient is φ = 12920646.

The previous prime is 12920581. The next prime is 12920653. The reversal of 12920647 is 74602921.

12920647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (74602921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12920647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12920657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6460323 + 6460324.

It is an arithmetic number, because the mean of its divisors is an integer number (6460324).

Almost surely, 2^12920647 is an apocalyptic number.

12920647 is a deficient number, since it is larger than the sum of its proper divisors (1).

12920647 is an equidigital number, since it uses as much as digits as its factorization.

12920647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 12920647 is about 3594.5301501031. The cubic root of 12920647 is about 234.6540677511.

The spelling of 12920647 in words is "twelve million, nine hundred twenty thousand, six hundred forty-seven".