129259289 has 2 divisors, whose sum is σ = 129259290. Its totient is φ = 129259288.

The previous prime is 129259283. The next prime is 129259307. The reversal of 129259289 is 982952921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80371225 + 48888064 = 8965^2 + 6992^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129259289 is a prime.

It is not a weakly prime, because it can be changed into another prime (129259283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64629644 + 64629645.

It is an arithmetic number, because the mean of its divisors is an integer number (64629645).

Almost surely, 2^129259289 is an apocalyptic number.

It is an amenable number.

129259289 is a deficient number, since it is larger than the sum of its proper divisors (1).

129259289 is an equidigital number, since it uses as much as digits as its factorization.

129259289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 47.

The square root of 129259289 is about 11369.2255233151. The cubic root of 129259289 is about 505.6157427321.

The spelling of 129259289 in words is "one hundred twenty-nine million, two hundred fifty-nine thousand, two hundred eighty-nine".