129805613 has 4 divisors (see below), whose sum is σ = 148349280. Its totient is φ = 111261948.

The previous prime is 129805597. The next prime is 129805619. The reversal of 129805613 is 316508921.

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, and also an emirpimes, since its reverse is a distinct semiprime: 316508921 = 167 ⋅1895263.

It is not a de Polignac number, because 129805613 - 2⁴ = 129805597 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 (129805619) 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, 9271823 + ... + 9271836.

It is an arithmetic number, because the mean of its divisors is an integer number (37087320).

Almost surely, 2^129805613 is an apocalyptic number.

It is an amenable number.

129805613 is a deficient number, since it is larger than the sum of its proper divisors (18543667).

129805613 is an equidigital number, since it uses as much as digits as its factorization.

129805613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18543666.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 129805613 is about 11393.2266281331. The cubic root of 129805613 is about 506.3270823439.

The spelling of 129805613 in words is "one hundred twenty-nine million, eight hundred five thousand, six hundred thirteen".