129104779 has 4 divisors (see below), whose sum is σ = 131031784. Its totient is φ = 127177776.

The previous prime is 129104761. The next prime is 129104879. The reversal of 129104779 is 977401921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977401921 = 3911 ⋅249911.

It is a cyclic number.

It is not a de Polignac number, because 129104779 - 2⁵ = 129104747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129104719) 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, 963402 + ... + 963535.

It is an arithmetic number, because the mean of its divisors is an integer number (32757946).

Almost surely, 2^129104779 is an apocalyptic number.

129104779 is a deficient number, since it is larger than the sum of its proper divisors (1927005).

129104779 is an equidigital number, since it uses as much as digits as its factorization.

129104779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927004.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 129104779 is about 11362.4283936138. The cubic root of 129104779 is about 505.4141999322.

It can be divided in two parts, 12910 and 4779, that added together give a square (17689 = 133²).

The spelling of 129104779 in words is "one hundred twenty-nine million, one hundred four thousand, seven hundred seventy-nine".