128284909 has 2 divisors, whose sum is σ = 128284910. Its totient is φ = 128284908.

The previous prime is 128284879. The next prime is 128284931. The reversal of 128284909 is 909482821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118330884 + 9954025 = 10878^2 + 3155^2 .

It is a cyclic number.

It is not a de Polignac number, because 128284909 - 2¹⁹ = 127760621 is a prime.

It is a super-3 number, since 3×128284909³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128284969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64142454 + 64142455.

It is an arithmetic number, because the mean of its divisors is an integer number (64142455).

Almost surely, 2^128284909 is an apocalyptic number.

It is an amenable number.

128284909 is a deficient number, since it is larger than the sum of its proper divisors (1).

128284909 is an equidigital number, since it uses as much as digits as its factorization.

128284909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 128284909 is about 11326.2928180407. The cubic root of 128284909 is about 504.3420625023.

The spelling of 128284909 in words is "one hundred twenty-eight million, two hundred eighty-four thousand, nine hundred nine".