79659709 has 2 divisors, whose sum is σ = 79659710. Its totient is φ = 79659708.

The previous prime is 79659691. The next prime is 79659719. The reversal of 79659709 is 90795697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46539684 + 33120025 = 6822^2 + 5755^2 .

It is a cyclic number.

It is not a de Polignac number, because 79659709 - 2⁷ = 79659581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79659719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39829854 + 39829855.

It is an arithmetic number, because the mean of its divisors is an integer number (39829855).

Almost surely, 2^79659709 is an apocalyptic number.

It is an amenable number.

79659709 is a deficient number, since it is larger than the sum of its proper divisors (1).

79659709 is an equidigital number, since it uses as much as digits as its factorization.

79659709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1071630, while the sum is 52.

The square root of 79659709 is about 8925.2287925857. The cubic root of 79659709 is about 430.2751240939.

The spelling of 79659709 in words is "seventy-nine million, six hundred fifty-nine thousand, seven hundred nine".