128529407 has 2 divisors, whose sum is σ = 128529408. Its totient is φ = 128529406.

The previous prime is 128529403. The next prime is 128529409. The reversal of 128529407 is 704925821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128529407 - 2² = 128529403 is a prime.

Together with 128529409, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128529403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64264703 + 64264704.

It is an arithmetic number, because the mean of its divisors is an integer number (64264704).

Almost surely, 2^128529407 is an apocalyptic number.

128529407 is a deficient number, since it is larger than the sum of its proper divisors (1).

128529407 is an equidigital number, since it uses as much as digits as its factorization.

128529407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 128529407 is about 11337.0810617195. The cubic root of 128529407 is about 504.6622674020.

The spelling of 128529407 in words is "one hundred twenty-eight million, five hundred twenty-nine thousand, four hundred seven".