129309149 has 4 divisors (see below), whose sum is σ = 129367836. Its totient is φ = 129250464.

The previous prime is 129309143. The next prime is 129309199. The reversal of 129309149 is 941903921.

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 41512249 + 87796900 = 6443^2 + 9370^2 .

It is a cyclic number.

It is not a de Polignac number, because 129309149 - 2¹² = 129305053 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 (129309143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25904 + ... + 30489.

It is an arithmetic number, because the mean of its divisors is an integer number (32341959).

Almost surely, 2^129309149 is an apocalyptic number.

It is an amenable number.

129309149 is a deficient number, since it is larger than the sum of its proper divisors (58687).

129309149 is an equidigital number, since it uses as much as digits as its factorization.

129309149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58686.

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

The square root of 129309149 is about 11371.4180733979. The cubic root of 129309149 is about 505.6807458236.

The spelling of 129309149 in words is "one hundred twenty-nine million, three hundred nine thousand, one hundred forty-nine".