129036779 has 4 divisors (see below), whose sum is σ = 129060960. Its totient is φ = 129012600.

The previous prime is 129036767. The next prime is 129036811. The reversal of 129036779 is 977630921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129036779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129056779) 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, 164 + ... + 16065.

It is an arithmetic number, because the mean of its divisors is an integer number (32265240).

Almost surely, 2^129036779 is an apocalyptic number.

129036779 is a deficient number, since it is larger than the sum of its proper divisors (24181).

129036779 is an equidigital number, since it uses as much as digits as its factorization.

129036779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24180.

The product of its (nonzero) digits is 142884, while the sum is 44.

The square root of 129036779 is about 11359.4356814060. The cubic root of 129036779 is about 505.3254497930.

The spelling of 129036779 in words is "one hundred twenty-nine million, thirty-six thousand, seven hundred seventy-nine".