128302813 has 2 divisors, whose sum is σ = 128302814. Its totient is φ = 128302812.

The previous prime is 128302787. The next prime is 128302819. The reversal of 128302813 is 318203821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76073284 + 52229529 = 8722^2 + 7227^2 .

It is a cyclic number.

It is not a de Polignac number, because 128302813 - 2⁵ = 128302781 is a prime.

It is a super-2 number, since 2×128302813² = 32923223647425938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128302819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64151406 + 64151407.

It is an arithmetic number, because the mean of its divisors is an integer number (64151407).

Almost surely, 2^128302813 is an apocalyptic number.

It is an amenable number.

128302813 is a deficient number, since it is larger than the sum of its proper divisors (1).

128302813 is an equidigital number, since it uses as much as digits as its factorization.

128302813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 128302813 is about 11327.0831638158. The cubic root of 128302813 is about 504.3655241350.

The spelling of 128302813 in words is "one hundred twenty-eight million, three hundred two thousand, eight hundred thirteen".