128834009 has 2 divisors, whose sum is σ = 128834010. Its totient is φ = 128834008.

The previous prime is 128833961. The next prime is 128834023. The reversal of 128834009 is 900438821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108222409 + 20611600 = 10403^2 + 4540^2 .

It is a cyclic number.

It is not a de Polignac number, because 128834009 - 2²⁴ = 112056793 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128834009.

It is not a weakly prime, because it can be changed into another prime (128834029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64417004 + 64417005.

It is an arithmetic number, because the mean of its divisors is an integer number (64417005).

Almost surely, 2^128834009 is an apocalyptic number.

It is an amenable number.

128834009 is a deficient number, since it is larger than the sum of its proper divisors (1).

128834009 is an equidigital number, since it uses as much as digits as its factorization.

128834009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 128834009 is about 11350.5069930819. The cubic root of 128834009 is about 505.0606194590.

The spelling of 128834009 in words is "one hundred twenty-eight million, eight hundred thirty-four thousand, nine".