9678509 has 2 divisors, whose sum is σ = 9678510. Its totient is φ = 9678508.

The previous prime is 9678503. The next prime is 9678511. The reversal of 9678509 is 9058769.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5175625 + 4502884 = 2275^2 + 2122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9678509 is a prime.

Together with 9678511, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 9678509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9678503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4839254 + 4839255.

It is an arithmetic number, because the mean of its divisors is an integer number (4839255).

Almost surely, 2^9678509 is an apocalyptic number.

It is an amenable number.

9678509 is a deficient number, since it is larger than the sum of its proper divisors (1).

9678509 is an equidigital number, since it uses as much as digits as its factorization.

9678509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 9678509 is about 3111.0302152181. The cubic root of 9678509 is about 213.1095045536.

The spelling of 9678509 in words is "nine million, six hundred seventy-eight thousand, five hundred nine".