128084813 has 2 divisors, whose sum is σ = 128084814. Its totient is φ = 128084812.

The previous prime is 128084809. The next prime is 128084819. The reversal of 128084813 is 318480821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112741924 + 15342889 = 10618^2 + 3917^2 .

It is a cyclic number.

It is not a de Polignac number, because 128084813 - 2² = 128084809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128084819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64042406 + 64042407.

It is an arithmetic number, because the mean of its divisors is an integer number (64042407).

Almost surely, 2^128084813 is an apocalyptic number.

It is an amenable number.

128084813 is a deficient number, since it is larger than the sum of its proper divisors (1).

128084813 is an equidigital number, since it uses as much as digits as its factorization.

128084813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 128084813 is about 11317.4561187574. The cubic root of 128084813 is about 504.0797054698.

The spelling of 128084813 in words is "one hundred twenty-eight million, eighty-four thousand, eight hundred thirteen".