128146309 has 2 divisors, whose sum is σ = 128146310. Its totient is φ = 128146308.

The previous prime is 128146297. The next prime is 128146327. The reversal of 128146309 is 903641821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104652900 + 23493409 = 10230^2 + 4847^2 .

It is a cyclic number.

It is not a de Polignac number, because 128146309 - 2²⁵ = 94591877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128846309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64073154 + 64073155.

It is an arithmetic number, because the mean of its divisors is an integer number (64073155).

Almost surely, 2^128146309 is an apocalyptic number.

It is an amenable number.

128146309 is a deficient number, since it is larger than the sum of its proper divisors (1).

128146309 is an equidigital number, since it uses as much as digits as its factorization.

128146309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 128146309 is about 11320.1726576939. The cubic root of 128146309 is about 504.1603653729.

The spelling of 128146309 in words is "one hundred twenty-eight million, one hundred forty-six thousand, three hundred nine".