128288929 has 2 divisors, whose sum is σ = 128288930. Its totient is φ = 128288928.

The previous prime is 128288921. The next prime is 128288933. The reversal of 128288929 is 929882821.

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., 76160529 + 52128400 = 8727^2 + 7220^2 .

It is a cyclic number.

It is not a de Polignac number, because 128288929 - 2³ = 128288921 is a prime.

It is not a weakly prime, because it can be changed into another prime (128288921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64144464 + 64144465.

It is an arithmetic number, because the mean of its divisors is an integer number (64144465).

Almost surely, 2^128288929 is an apocalyptic number.

It is an amenable number.

128288929 is a deficient number, since it is larger than the sum of its proper divisors (1).

128288929 is an equidigital number, since it uses as much as digits as its factorization.

128288929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 49.

The square root of 128288929 is about 11326.4702798356. The cubic root of 128288929 is about 504.3473305522.

The spelling of 128288929 in words is "one hundred twenty-eight million, two hundred eighty-eight thousand, nine hundred twenty-nine".