128717629 has 2 divisors, whose sum is σ = 128717630. Its totient is φ = 128717628.

The previous prime is 128717599. The next prime is 128717651. The reversal of 128717629 is 926717821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115562500 + 13155129 = 10750^2 + 3627^2 .

It is a cyclic number.

It is not a de Polignac number, because 128717629 - 2⁵ = 128717597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128717129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64358814 + 64358815.

It is an arithmetic number, because the mean of its divisors is an integer number (64358815).

Almost surely, 2^128717629 is an apocalyptic number.

It is an amenable number.

128717629 is a deficient number, since it is larger than the sum of its proper divisors (1).

128717629 is an equidigital number, since it uses as much as digits as its factorization.

128717629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 43.

The square root of 128717629 is about 11345.3791915475. The cubic root of 128717629 is about 504.9084943505.

The spelling of 128717629 in words is "one hundred twenty-eight million, seven hundred seventeen thousand, six hundred twenty-nine".