79817 has 2 divisors, whose sum is σ = 79818. Its totient is φ = 79816.

The previous prime is 79813. The next prime is 79823. The reversal of 79817 is 71897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48841 + 30976 = 221^2 + 176^2 .

It is a cyclic number.

It is not a de Polignac number, because 79817 - 2² = 79813 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39908 + 39909.

It is an arithmetic number, because the mean of its divisors is an integer number (39909).

2⁷⁹⁸¹⁷ is an apocalyptic number.

It is an amenable number.

79817 is a deficient number, since it is larger than the sum of its proper divisors (1).

79817 is an equidigital number, since it uses as much as digits as its factorization.

79817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 32.

The square root of 79817 is about 282.5190259080. The cubic root of 79817 is about 43.0558135877.

The spelling of 79817 in words is "seventy-nine thousand, eight hundred seventeen".