3216509 has 2 divisors, whose sum is σ = 3216510. Its totient is φ = 3216508.

The previous prime is 3216497. The next prime is 3216511. The reversal of 3216509 is 9056123.

3216509 is digitally balanced in base 2, 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., 3161284 + 55225 = 1778^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 3216509 - 2¹² = 3212413 is a prime.

It is a super-3 number, since 3×3216509³ = 99833332294372080687, which contains 333 as substring.

It is a Sophie Germain prime.

Together with 3216511, 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 Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3216559) 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, 1608254 + 1608255.

It is an arithmetic number, because the mean of its divisors is an integer number (1608255).

Almost surely, 2^3216509 is an apocalyptic number.

It is an amenable number.

3216509 is a deficient number, since it is larger than the sum of its proper divisors (1).

3216509 is an equidigital number, since it uses as much as digits as its factorization.

3216509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 3216509 is about 1793.4628515807. The cubic root of 3216509 is about 147.6142407119.

The spelling of 3216509 in words is "three million, two hundred sixteen thousand, five hundred nine".