129779107 has 4 divisors (see below), whose sum is σ = 129804696. Its totient is φ = 129753520.

The previous prime is 129779099. The next prime is 129779119. The reversal of 129779107 is 701977921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 701977921 = 9661 ⋅72661.

It is a cyclic number.

It is not a de Polignac number, because 129779107 - 2³ = 129779099 is a prime.

It is a super-2 number, since 2×129779107² = 33685233227434898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129779407) 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, 2338 + ... + 16279.

It is an arithmetic number, because the mean of its divisors is an integer number (32451174).

Almost surely, 2^129779107 is an apocalyptic number.

129779107 is a deficient number, since it is larger than the sum of its proper divisors (25589).

129779107 is an equidigital number, since it uses as much as digits as its factorization.

129779107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25588.

The product of its (nonzero) digits is 55566, while the sum is 43.

The square root of 129779107 is about 11392.0633337425. The cubic root of 129779107 is about 506.2926163992.

The spelling of 129779107 in words is "one hundred twenty-nine million, seven hundred seventy-nine thousand, one hundred seven".