129208903 has 2 divisors, whose sum is σ = 129208904. Its totient is φ = 129208902.

The previous prime is 129208901. The next prime is 129208913. The reversal of 129208903 is 309802921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129208903 - 2¹ = 129208901 is a prime.

It is a super-2 number, since 2×129208903² = 33389881228926818, which contains 22 as substring.

Together with 129208901, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129208901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64604451 + 64604452.

It is an arithmetic number, because the mean of its divisors is an integer number (64604452).

Almost surely, 2^129208903 is an apocalyptic number.

129208903 is a deficient number, since it is larger than the sum of its proper divisors (1).

129208903 is an equidigital number, since it uses as much as digits as its factorization.

129208903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 129208903 is about 11367.0094132098. The cubic root of 129208903 is about 505.5500369043.

The spelling of 129208903 in words is "one hundred twenty-nine million, two hundred eight thousand, nine hundred three".