128302129 has 2 divisors, whose sum is σ = 128302130. Its totient is φ = 128302128.

The previous prime is 128302039. The next prime is 128302157. The reversal of 128302129 is 921203821.

128302129 = T₉₂₄₇ + T₉₂₄₈ + T₉₂₄₉.

It is an a-pointer prime, because the next prime (128302157) can be obtained adding 128302129 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105021504 + 23280625 = 10248^2 + 4825^2 .

It is a cyclic number.

It is not a de Polignac number, because 128302129 - 2⁷ = 128302001 is a prime.

It is a super-2 number, since 2×128302129² = 32922872611865282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128302097 and 128302106.

It is not a weakly prime, because it can be changed into another prime (128302159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64151064 + 64151065.

It is an arithmetic number, because the mean of its divisors is an integer number (64151065).

Almost surely, 2^128302129 is an apocalyptic number.

128302129 is the 9249-th centered triangular number.

It is an amenable number.

128302129 is a deficient number, since it is larger than the sum of its proper divisors (1).

128302129 is an equidigital number, since it uses as much as digits as its factorization.

128302129 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 128302129 is about 11327.0529706539. The cubic root of 128302129 is about 504.3646278527.

The spelling of 128302129 in words is "one hundred twenty-eight million, three hundred two thousand, one hundred twenty-nine".