128218313 has 2 divisors, whose sum is σ = 128218314. Its totient is φ = 128218312.

The previous prime is 128218297. The next prime is 128218331. The reversal of 128218313 is 313812821.

Together with next prime (128218331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75394489 + 52823824 = 8683^2 + 7268^2 .

It is a cyclic number.

It is not a de Polignac number, because 128218313 - 2⁴ = 128218297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128218373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64109156 + 64109157.

It is an arithmetic number, because the mean of its divisors is an integer number (64109157).

Almost surely, 2^128218313 is an apocalyptic number.

It is an amenable number.

128218313 is a deficient number, since it is larger than the sum of its proper divisors (1).

128218313 is an equidigital number, since it uses as much as digits as its factorization.

128218313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 29.

The square root of 128218313 is about 11323.3525512544. The cubic root of 128218313 is about 504.2547750785.

The spelling of 128218313 in words is "one hundred twenty-eight million, two hundred eighteen thousand, three hundred thirteen".