129003899 has 4 divisors (see below), whose sum is σ = 129083136. Its totient is φ = 128924664.

The previous prime is 129003869. The next prime is 129003911. The reversal of 129003899 is 998300921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 998300921 = 587 ⋅1700683.

It is a cyclic number.

It is not a de Polignac number, because 129003899 - 2¹² = 128999803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129003839) 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, 37124 + ... + 40449.

It is an arithmetic number, because the mean of its divisors is an integer number (32270784).

Almost surely, 2^129003899 is an apocalyptic number.

129003899 is a deficient number, since it is larger than the sum of its proper divisors (79237).

129003899 is an equidigital number, since it uses as much as digits as its factorization.

129003899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79236.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 129003899 is about 11357.9883342078. The cubic root of 129003899 is about 505.2825253071.

The spelling of 129003899 in words is "one hundred twenty-nine million, three thousand, eight hundred ninety-nine".