78317 has 2 divisors, whose sum is σ = 78318. Its totient is φ = 78316.

The previous prime is 78311. The next prime is 78341. The reversal of 78317 is 71387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67081 + 11236 = 259^2 + 106^2 .

78317 is a truncatable prime.

It is an emirp because it is prime and its reverse (71387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78317 - 2⁴ = 78301 is a prime.

It is a super-2 number, since 2×78317² = 12267104978, which contains 22 as substring.

It is a nialpdrome in base 7.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39158 + 39159.

It is an arithmetic number, because the mean of its divisors is an integer number (39159).

2⁷⁸³¹⁷ is an apocalyptic number.

It is an amenable number.

78317 is a deficient number, since it is larger than the sum of its proper divisors (1).

78317 is an equidigital number, since it uses as much as digits as its factorization.

78317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1176, while the sum is 26.

The square root of 78317 is about 279.8517464659. The cubic root of 78317 is about 42.7843903248.

The spelling of 78317 in words is "seventy-eight thousand, three hundred seventeen".