128000813 has 2 divisors, whose sum is σ = 128000814. Its totient is φ = 128000812.

The previous prime is 128000749. The next prime is 128000827. The reversal of 128000813 is 318000821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96786244 + 31214569 = 9838^2 + 5587^2 .

It is a cyclic number.

It is not a de Polignac number, because 128000813 - 2⁶ = 128000749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128000833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64000406 + 64000407.

It is an arithmetic number, because the mean of its divisors is an integer number (64000407).

Almost surely, 2^128000813 is an apocalyptic number.

It is an amenable number.

128000813 is a deficient number, since it is larger than the sum of its proper divisors (1).

128000813 is an equidigital number, since it uses as much as digits as its factorization.

128000813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 128000813 is about 11313.7444287910. The cubic root of 128000813 is about 503.9694869513.

The spelling of 128000813 in words is "one hundred twenty-eight million, eight hundred thirteen", and thus it is an aban number.