3656509 has 2 divisors, whose sum is σ = 3656510. Its totient is φ = 3656508.

The previous prime is 3656491. The next prime is 3656537. The reversal of 3656509 is 9056563.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2340900 + 1315609 = 1530^2 + 1147^2 .

It is a cyclic number.

It is not a de Polignac number, because 3656509 - 2¹³ = 3648317 is a prime.

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

3656509 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3656539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1828254 + 1828255.

It is an arithmetic number, because the mean of its divisors is an integer number (1828255).

Almost surely, 2^3656509 is an apocalyptic number.

It is an amenable number.

3656509 is a deficient number, since it is larger than the sum of its proper divisors (1).

3656509 is an equidigital number, since it uses as much as digits as its factorization.

3656509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 34.

The square root of 3656509 is about 1912.2000418366. The cubic root of 3656509 is about 154.0596412607.

The spelling of 3656509 in words is "three million, six hundred fifty-six thousand, five hundred nine".