128116817 has 2 divisors, whose sum is σ = 128116818. Its totient is φ = 128116816.

The previous prime is 128116799. The next prime is 128116819. The reversal of 128116817 is 718611821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86694721 + 41422096 = 9311^2 + 6436^2 .

It is a cyclic number.

It is not a de Polignac number, because 128116817 - 2¹⁴ = 128100433 is a prime.

It is a super-2 number, since 2×128116817² = 32827837596422978, which contains 22 as substring.

Together with 128116819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128116819) 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, 64058408 + 64058409.

It is an arithmetic number, because the mean of its divisors is an integer number (64058409).

Almost surely, 2^128116817 is an apocalyptic number.

It is an amenable number.

128116817 is a deficient number, since it is larger than the sum of its proper divisors (1).

128116817 is an equidigital number, since it uses as much as digits as its factorization.

128116817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 35.

The square root of 128116817 is about 11318.8699524290. The cubic root of 128116817 is about 504.1216860477.

The spelling of 128116817 in words is "one hundred twenty-eight million, one hundred sixteen thousand, eight hundred seventeen".