129899279 has 2 divisors, whose sum is σ = 129899280. Its totient is φ = 129899278.

The previous prime is 129899251. The next prime is 129899303. The reversal of 129899279 is 972998921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129899279 - 2²⁰ = 128850703 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 (129899249) 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, 64949639 + 64949640.

It is an arithmetic number, because the mean of its divisors is an integer number (64949640).

Almost surely, 2^129899279 is an apocalyptic number.

129899279 is a deficient number, since it is larger than the sum of its proper divisors (1).

129899279 is an equidigital number, since it uses as much as digits as its factorization.

129899279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 56.

The square root of 129899279 is about 11397.3364870921. The cubic root of 129899279 is about 506.4488393536.

The spelling of 129899279 in words is "one hundred twenty-nine million, eight hundred ninety-nine thousand, two hundred seventy-nine".