129136279 has 2 divisors, whose sum is σ = 129136280. Its totient is φ = 129136278.

The previous prime is 129136247. The next prime is 129136303. The reversal of 129136279 is 972631921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129136279 - 2⁵ = 129136247 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129136229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64568139 + 64568140.

It is an arithmetic number, because the mean of its divisors is an integer number (64568140).

Almost surely, 2^129136279 is an apocalyptic number.

129136279 is a deficient number, since it is larger than the sum of its proper divisors (1).

129136279 is an equidigital number, since it uses as much as digits as its factorization.

129136279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 40.

The square root of 129136279 is about 11363.8144564226. The cubic root of 129136279 is about 505.4553015676.

The spelling of 129136279 in words is "one hundred twenty-nine million, one hundred thirty-six thousand, two hundred seventy-nine".