129008249 has 4 divisors (see below), whose sum is σ = 129044580. Its totient is φ = 128971920.

The previous prime is 129008183. The next prime is 129008261. The reversal of 129008249 is 942800921.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34140649 + 94867600 = 5843^2 + 9740^2 .

It is a cyclic number.

It is not a de Polignac number, because 129008249 - 2¹² = 129004153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129008549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12182 + ... + 20159.

It is an arithmetic number, because the mean of its divisors is an integer number (32261145).

Almost surely, 2^129008249 is an apocalyptic number.

It is an amenable number.

129008249 is a deficient number, since it is larger than the sum of its proper divisors (36331).

129008249 is an equidigital number, since it uses as much as digits as its factorization.

129008249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36330.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 129008249 is about 11358.1798277717. The cubic root of 129008249 is about 505.2882046039.

The spelling of 129008249 in words is "one hundred twenty-nine million, eight thousand, two hundred forty-nine".