128817097 has 2 divisors, whose sum is σ = 128817098. Its totient is φ = 128817096.

The previous prime is 128817077. The next prime is 128817179. The reversal of 128817097 is 790718821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71723961 + 57093136 = 8469^2 + 7556^2 .

It is a cyclic number.

It is not a de Polignac number, because 128817097 - 2¹⁹ = 128292809 is a prime.

It is not a weakly prime, because it can be changed into another prime (128817037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64408548 + 64408549.

It is an arithmetic number, because the mean of its divisors is an integer number (64408549).

Almost surely, 2^128817097 is an apocalyptic number.

It is an amenable number.

128817097 is a deficient number, since it is larger than the sum of its proper divisors (1).

128817097 is an equidigital number, since it uses as much as digits as its factorization.

128817097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 43.

The square root of 128817097 is about 11349.7619798831. The cubic root of 128817097 is about 505.0385187755.

The spelling of 128817097 in words is "one hundred twenty-eight million, eight hundred seventeen thousand, ninety-seven".