129952109 has 4 divisors (see below), whose sum is σ = 148516704. Its totient is φ = 111387516.

The previous prime is 129952091. The next prime is 129952117. The reversal of 129952109 is 901259921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129952109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129952159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9282287 + ... + 9282300.

It is an arithmetic number, because the mean of its divisors is an integer number (37129176).

Almost surely, 2^129952109 is an apocalyptic number.

It is an amenable number.

129952109 is a deficient number, since it is larger than the sum of its proper divisors (18564595).

129952109 is an equidigital number, since it uses as much as digits as its factorization.

129952109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18564594.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 129952109 is about 11399.6538982550. The cubic root of 129952109 is about 506.5174875812.

The spelling of 129952109 in words is "one hundred twenty-nine million, nine hundred fifty-two thousand, one hundred nine".