128120429 has 2 divisors, whose sum is σ = 128120430. Its totient is φ = 128120428.

The previous prime is 128120393. The next prime is 128120431. The reversal of 128120429 is 924021821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128029225 + 91204 = 11315^2 + 302^2 .

It is a cyclic number.

It is not a de Polignac number, because 128120429 - 2¹² = 128116333 is a prime.

Together with 128120431, 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 (128120029) 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, 64060214 + 64060215.

It is an arithmetic number, because the mean of its divisors is an integer number (64060215).

Almost surely, 2^128120429 is an apocalyptic number.

It is an amenable number.

128120429 is a deficient number, since it is larger than the sum of its proper divisors (1).

128120429 is an equidigital number, since it uses as much as digits as its factorization.

128120429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 128120429 is about 11319.0295078686. The cubic root of 128120429 is about 504.1264235741.

The spelling of 128120429 in words is "one hundred twenty-eight million, one hundred twenty thousand, four hundred twenty-nine".