129955279 has 2 divisors, whose sum is σ = 129955280. Its totient is φ = 129955278.

The previous prime is 129955261. The next prime is 129955283. The reversal of 129955279 is 972559921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129955279 - 2⁵ = 129955247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129955879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64977639 + 64977640.

It is an arithmetic number, because the mean of its divisors is an integer number (64977640).

Almost surely, 2^129955279 is an apocalyptic number.

129955279 is a deficient number, since it is larger than the sum of its proper divisors (1).

129955279 is an equidigital number, since it uses as much as digits as its factorization.

129955279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 510300, while the sum is 49.

The square root of 129955279 is about 11399.7929367160. The cubic root of 129955279 is about 506.5216061430.

The spelling of 129955279 in words is "one hundred twenty-nine million, nine hundred fifty-five thousand, two hundred seventy-nine".