129109013 has 4 divisors (see below), whose sum is σ = 140846208. Its totient is φ = 117371820.

The previous prime is 129108997. The next prime is 129109031. The reversal of 129109013 is 310901921.

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 not a de Polignac number, because 129109013 - 2⁴ = 129108997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129109063) 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, 5868581 + ... + 5868602.

It is an arithmetic number, because the mean of its divisors is an integer number (35211552).

Almost surely, 2^129109013 is an apocalyptic number.

It is an amenable number.

129109013 is a deficient number, since it is larger than the sum of its proper divisors (11737195).

129109013 is a wasteful number, since it uses less digits than its factorization.

129109013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11737194.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 129109013 is about 11362.6147078918. The cubic root of 129109013 is about 505.4197249028.

The spelling of 129109013 in words is "one hundred twenty-nine million, one hundred nine thousand, thirteen".