129149903 has 4 divisors (see below), whose sum is σ = 129565488. Its totient is φ = 128734320.

The previous prime is 129149873. The next prime is 129149929. The reversal of 129149903 is 309941921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129149903 - 2²⁰ = 128101327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129140903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207326 + ... + 207947.

It is an arithmetic number, because the mean of its divisors is an integer number (32391372).

Almost surely, 2^129149903 is an apocalyptic number.

129149903 is a deficient number, since it is larger than the sum of its proper divisors (415585).

129149903 is an equidigital number, since it uses as much as digits as its factorization.

129149903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415584.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 129149903 is about 11364.4138872183. The cubic root of 129149903 is about 505.4730762806.

The spelling of 129149903 in words is "one hundred twenty-nine million, one hundred forty-nine thousand, nine hundred three".