79791307129 has 2 divisors, whose sum is σ = 79791307130. Its totient is φ = 79791307128.

The previous prime is 79791307121. The next prime is 79791307207. The reversal of 79791307129 is 92170319797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71423631504 + 8367675625 = 267252^2 + 91475^2 .

It is a cyclic number.

It is not a de Polignac number, because 79791307129 - 2³ = 79791307121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79791307129.

It is not a weakly prime, because it can be changed into another prime (79791307121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39895653564 + 39895653565.

It is an arithmetic number, because the mean of its divisors is an integer number (39895653565).

Almost surely, 2^79791307129 is an apocalyptic number.

It is an amenable number.

79791307129 is a deficient number, since it is larger than the sum of its proper divisors (1).

79791307129 is an equidigital number, since it uses as much as digits as its factorization.

79791307129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500282, while the sum is 55.

The spelling of 79791307129 in words is "seventy-nine billion, seven hundred ninety-one million, three hundred seven thousand, one hundred twenty-nine".