80309 has 2 divisors, whose sum is σ = 80310. Its totient is φ = 80308.
The previous prime is 80287. The next prime is 80317. The reversal of 80309 is 90308.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 77284 + 3025 = 278^2 + 55^2 .
It is a cyclic number.
It is not a de Polignac number, because 80309 - 212 = 76213 is a prime.
It is a Sophie Germain prime.
It is a Curzon number.
It is a plaindrome in base 15.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (80329) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40154 + 40155.
It is an arithmetic number, because the mean of its divisors is an integer number (40155).
280309 is an apocalyptic number.
It is an amenable number.
80309 is a deficient number, since it is larger than the sum of its proper divisors (1).
80309 is an equidigital number, since it uses as much as digits as its factorization.
80309 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 216, while the sum is 20.
The square root of 80309 is about 283.3884260163. The cubic root of 80309 is about 43.1440992205.
Subtracting 80309 from its reverse (90308), we obtain a palindrome (9999).
The spelling of 80309 in words is "eighty thousand, three hundred nine".
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