128341217 has 2 divisors, whose sum is σ = 128341218. Its totient is φ = 128341216.

The previous prime is 128341163. The next prime is 128341223. The reversal of 128341217 is 712143821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128232976 + 108241 = 11324^2 + 329^2 .

It is a cyclic number.

It is not a de Polignac number, because 128341217 - 2¹⁶ = 128275681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128341217.

It is not a weakly prime, because it can be changed into another prime (128341237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64170608 + 64170609.

It is an arithmetic number, because the mean of its divisors is an integer number (64170609).

Almost surely, 2^128341217 is an apocalyptic number.

It is an amenable number.

128341217 is a deficient number, since it is larger than the sum of its proper divisors (1).

128341217 is an equidigital number, since it uses as much as digits as its factorization.

128341217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 29.

The square root of 128341217 is about 11328.7782659914. The cubic root of 128341217 is about 504.4158418713.

The spelling of 128341217 in words is "one hundred twenty-eight million, three hundred forty-one thousand, two hundred seventeen".