129941909 has 4 divisors (see below), whose sum is σ = 129976716. Its totient is φ = 129907104.

The previous prime is 129941873. The next prime is 129941921. The reversal of 129941909 is 909149921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 909149921 = 421 ⋅2159501.

It can be written as a sum of positive squares in 2 ways, for example, as 18576100 + 111365809 = 4310^2 + 10553^2 .

It is a cyclic number.

It is not a de Polignac number, because 129941909 - 2²⁰ = 128893333 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129941909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129941939) 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, 11024 + ... + 19529.

It is an arithmetic number, because the mean of its divisors is an integer number (32494179).

Almost surely, 2^129941909 is an apocalyptic number.

It is an amenable number.

129941909 is a deficient number, since it is larger than the sum of its proper divisors (34807).

129941909 is an equidigital number, since it uses as much as digits as its factorization.

129941909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34806.

The product of its (nonzero) digits is 52488, while the sum is 44.

The square root of 129941909 is about 11399.2065074724. The cubic root of 129941909 is about 506.5042349720.

The spelling of 129941909 in words is "one hundred twenty-nine million, nine hundred forty-one thousand, nine hundred nine".