79313813 has 2 divisors, whose sum is σ = 79313814. Its totient is φ = 79313812.

The previous prime is 79313797. The next prime is 79313827. The reversal of 79313813 is 31831397.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70593604 + 8720209 = 8402^2 + 2953^2 .

It is a cyclic number.

It is not a de Polignac number, because 79313813 - 2⁴ = 79313797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79313833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39656906 + 39656907.

It is an arithmetic number, because the mean of its divisors is an integer number (39656907).

Almost surely, 2^79313813 is an apocalyptic number.

It is an amenable number.

79313813 is a deficient number, since it is larger than the sum of its proper divisors (1).

79313813 is an equidigital number, since it uses as much as digits as its factorization.

79313813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 35.

The square root of 79313813 is about 8905.8302813382. The cubic root of 79313813 is about 429.6514445991.

The spelling of 79313813 in words is "seventy-nine million, three hundred thirteen thousand, eight hundred thirteen".