129691913 has 8 divisors (see below), whose sum is σ = 142916928. Its totient is φ = 116931024.

The previous prime is 129691909. The next prime is 129691921. The reversal of 129691913 is 319196921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129691913 - 2² = 129691909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129691213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115445 + ... + 116562.

It is an arithmetic number, because the mean of its divisors is an integer number (17864616).

Almost surely, 2^129691913 is an apocalyptic number.

129691913 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

129691913 is a deficient number, since it is larger than the sum of its proper divisors (13225015).

129691913 is a wasteful number, since it uses less digits than its factorization.

129691913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232063.

The product of its digits is 26244, while the sum is 41.

The square root of 129691913 is about 11388.2357281539. The cubic root of 129691913 is about 506.1792042850.

The spelling of 129691913 in words is "one hundred twenty-nine million, six hundred ninety-one thousand, nine hundred thirteen".