128077109 has 2 divisors, whose sum is σ = 128077110. Its totient is φ = 128077108.

The previous prime is 128077093. The next prime is 128077111. The reversal of 128077109 is 901770821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110040100 + 18037009 = 10490^2 + 4247^2 .

It is a cyclic number.

It is not a de Polignac number, because 128077109 - 2⁴ = 128077093 is a prime.

Together with 128077111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128077129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64038554 + 64038555.

It is an arithmetic number, because the mean of its divisors is an integer number (64038555).

Almost surely, 2^128077109 is an apocalyptic number.

It is an amenable number.

128077109 is a deficient number, since it is larger than the sum of its proper divisors (1).

128077109 is an equidigital number, since it uses as much as digits as its factorization.

128077109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 128077109 is about 11317.1157544668. The cubic root of 128077109 is about 504.0695988645.

The spelling of 128077109 in words is "one hundred twenty-eight million, seventy-seven thousand, one hundred nine".