8973509 has 2 divisors, whose sum is σ = 8973510. Its totient is φ = 8973508.

The previous prime is 8973493. The next prime is 8973521. The reversal of 8973509 is 9053798.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7480225 + 1493284 = 2735^2 + 1222^2 .

It is a cyclic number.

It is not a de Polignac number, because 8973509 - 2⁴ = 8973493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8973409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4486754 + 4486755.

It is an arithmetic number, because the mean of its divisors is an integer number (4486755).

Almost surely, 2^8973509 is an apocalyptic number.

It is an amenable number.

8973509 is a deficient number, since it is larger than the sum of its proper divisors (1).

8973509 is an equidigital number, since it uses as much as digits as its factorization.

8973509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 8973509 is about 2995.5815795935. The cubic root of 8973509 is about 207.8040946984.

The spelling of 8973509 in words is "eight million, nine hundred seventy-three thousand, five hundred nine".