12928813 has 2 divisors, whose sum is σ = 12928814. Its totient is φ = 12928812.

The previous prime is 12928757. The next prime is 12928819. The reversal of 12928813 is 31882921.

12928813 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 can be written as a sum of positive squares in only one way, i.e., 7606564 + 5322249 = 2758^2 + 2307^2 .

It is a cyclic number.

It is not a de Polignac number, because 12928813 - 2⁹ = 12928301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12928819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6464406 + 6464407.

It is an arithmetic number, because the mean of its divisors is an integer number (6464407).

Almost surely, 2^12928813 is an apocalyptic number.

It is an amenable number.

12928813 is a deficient number, since it is larger than the sum of its proper divisors (1).

12928813 is an equidigital number, since it uses as much as digits as its factorization.

12928813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 34.

The square root of 12928813 is about 3595.6658632303. The cubic root of 12928813 is about 234.7034920453.

The spelling of 12928813 in words is "twelve million, nine hundred twenty-eight thousand, eight hundred thirteen".