79810817 has 2 divisors, whose sum is σ = 79810818. Its totient is φ = 79810816.

The previous prime is 79810789. The next prime is 79810837. The reversal of 79810817 is 71801897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79584241 + 226576 = 8921^2 + 476^2 .

It is a cyclic number.

It is not a de Polignac number, because 79810817 - 2⁸ = 79810561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79810837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39905408 + 39905409.

It is an arithmetic number, because the mean of its divisors is an integer number (39905409).

Almost surely, 2^79810817 is an apocalyptic number.

It is an amenable number.

79810817 is a deficient number, since it is larger than the sum of its proper divisors (1).

79810817 is an equidigital number, since it uses as much as digits as its factorization.

79810817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 79810817 is about 8933.6899990989. The cubic root of 79810817 is about 430.5470179042.

The spelling of 79810817 in words is "seventy-nine million, eight hundred ten thousand, eight hundred seventeen".