129240079 has 2 divisors, whose sum is σ = 129240080. Its totient is φ = 129240078.

The previous prime is 129240061. The next prime is 129240121. The reversal of 129240079 is 970042921.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (970042921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129240079 - 2⁹ = 129239567 is a prime.

It is equal to p_7337554 and since 129240079 and 7337554 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129240019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64620039 + 64620040.

It is an arithmetic number, because the mean of its divisors is an integer number (64620040).

Almost surely, 2^129240079 is an apocalyptic number.

129240079 is a deficient number, since it is larger than the sum of its proper divisors (1).

129240079 is an equidigital number, since it uses as much as digits as its factorization.

129240079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 129240079 is about 11368.3806674478. The cubic root of 129240079 is about 505.5906939595.

The spelling of 129240079 in words is "one hundred twenty-nine million, two hundred forty thousand, seventy-nine".