128318429 has 2 divisors, whose sum is σ = 128318430. Its totient is φ = 128318428.

The previous prime is 128318389. The next prime is 128318461. The reversal of 128318429 is 924813821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84732025 + 43586404 = 9205^2 + 6602^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128318429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128318392 and 128318401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128318629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64159214 + 64159215.

It is an arithmetic number, because the mean of its divisors is an integer number (64159215).

Almost surely, 2^128318429 is an apocalyptic number.

It is an amenable number.

128318429 is a deficient number, since it is larger than the sum of its proper divisors (1).

128318429 is an equidigital number, since it uses as much as digits as its factorization.

128318429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 128318429 is about 11327.7724641696. The cubic root of 128318429 is about 504.3859857610.

The spelling of 128318429 in words is "one hundred twenty-eight million, three hundred eighteen thousand, four hundred twenty-nine".