129508903 has 2 divisors, whose sum is σ = 129508904. Its totient is φ = 129508902.

The previous prime is 129508877. The next prime is 129508909. The reversal of 129508903 is 309805921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129508903 - 2²⁵ = 95954471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129508909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64754451 + 64754452.

It is an arithmetic number, because the mean of its divisors is an integer number (64754452).

Almost surely, 2^129508903 is an apocalyptic number.

129508903 is a deficient number, since it is larger than the sum of its proper divisors (1).

129508903 is an equidigital number, since it uses as much as digits as its factorization.

129508903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 129508903 is about 11380.1978453804. The cubic root of 129508903 is about 505.9410001147.

The spelling of 129508903 in words is "one hundred twenty-nine million, five hundred eight thousand, nine hundred three".