128231029 has 2 divisors, whose sum is σ = 128231030. Its totient is φ = 128231028.

The previous prime is 128230919. The next prime is 128231063. The reversal of 128231029 is 920132821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124322500 + 3908529 = 11150^2 + 1977^2 .

It is a cyclic number.

It is not a de Polignac number, because 128231029 - 2⁹ = 128230517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128230988 and 128231006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128231329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64115514 + 64115515.

It is an arithmetic number, because the mean of its divisors is an integer number (64115515).

Almost surely, 2^128231029 is an apocalyptic number.

It is an amenable number.

128231029 is a deficient number, since it is larger than the sum of its proper divisors (1).

128231029 is an equidigital number, since it uses as much as digits as its factorization.

128231029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 128231029 is about 11323.9140318178. The cubic root of 128231029 is about 504.2714442828.

The spelling of 128231029 in words is "one hundred twenty-eight million, two hundred thirty-one thousand, twenty-nine".