128026109 has 2 divisors, whose sum is σ = 128026110. Its totient is φ = 128026108.

The previous prime is 128026081. The next prime is 128026117. The reversal of 128026109 is 901620821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112423609 + 15602500 = 10603^2 + 3950^2 .

It is an emirp because it is prime and its reverse (901620821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128026109 - 2⁸ = 128025853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128026139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64013054 + 64013055.

It is an arithmetic number, because the mean of its divisors is an integer number (64013055).

Almost surely, 2^128026109 is an apocalyptic number.

It is an amenable number.

128026109 is a deficient number, since it is larger than the sum of its proper divisors (1).

128026109 is an equidigital number, since it uses as much as digits as its factorization.

128026109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 128026109 is about 11314.8623058347. The cubic root of 128026109 is about 504.0026835437.

The spelling of 128026109 in words is "one hundred twenty-eight million, twenty-six thousand, one hundred nine".