128265829 has 2 divisors, whose sum is σ = 128265830. Its totient is φ = 128265828.

The previous prime is 128265763. The next prime is 128265847. The reversal of 128265829 is 928562821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72420100 + 55845729 = 8510^2 + 7473^2 .

It is a cyclic number.

It is not a de Polignac number, because 128265829 - 2⁷ = 128265701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128265229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64132914 + 64132915.

It is an arithmetic number, because the mean of its divisors is an integer number (64132915).

Almost surely, 2^128265829 is an apocalyptic number.

It is an amenable number.

128265829 is a deficient number, since it is larger than the sum of its proper divisors (1).

128265829 is an equidigital number, since it uses as much as digits as its factorization.

128265829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 43.

The square root of 128265829 is about 11325.4504987660. The cubic root of 128265829 is about 504.3170574212.

The spelling of 128265829 in words is "one hundred twenty-eight million, two hundred sixty-five thousand, eight hundred twenty-nine".