8280509 has 2 divisors, whose sum is σ = 8280510. Its totient is φ = 8280508.

The previous prime is 8280499. The next prime is 8280511. The reversal of 8280509 is 9050828.

8280509 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8265625 + 14884 = 2875^2 + 122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8280509 is a prime.

Together with 8280511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8285509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4140254 + 4140255.

It is an arithmetic number, because the mean of its divisors is an integer number (4140255).

Almost surely, 2^8280509 is an apocalyptic number.

It is an amenable number.

8280509 is a deficient number, since it is larger than the sum of its proper divisors (1).

8280509 is an equidigital number, since it uses as much as digits as its factorization.

8280509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 8280509 is about 2877.5873574924. The cubic root of 8280509 is about 202.3107737991.

The spelling of 8280509 in words is "eight million, two hundred eighty thousand, five hundred nine".