129505903 has 2 divisors, whose sum is σ = 129505904. Its totient is φ = 129505902.

The previous prime is 129505891. The next prime is 129505907. The reversal of 129505903 is 309505921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129505903 - 2⁹ = 129505391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129505907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64752951 + 64752952.

It is an arithmetic number, because the mean of its divisors is an integer number (64752952).

Almost surely, 2^129505903 is an apocalyptic number.

129505903 is a deficient number, since it is larger than the sum of its proper divisors (1).

129505903 is an equidigital number, since it uses as much as digits as its factorization.

129505903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 129505903 is about 11380.0660367153. The cubic root of 129505903 is about 505.9370934728.

The spelling of 129505903 in words is "one hundred twenty-nine million, five hundred five thousand, nine hundred three".