5656509 has 18 divisors (see below), whose sum is σ = 8628126. Its totient is φ = 3570480.

The previous prime is 5656493. The next prime is 5656549. The reversal of 5656509 is 9056565.

It can be written as a sum of positive squares in only one way, i.e., 2924100 + 2732409 = 1710^2 + 1653^2 .

It is not a de Polignac number, because 5656509 - 2⁴ = 5656493 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5656549) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2379 + ... + 4119.

Almost surely, 2^5656509 is an apocalyptic number.

It is an amenable number.

5656509 is a deficient number, since it is larger than the sum of its proper divisors (2971617).

5656509 is a wasteful number, since it uses less digits than its factorization.

5656509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785 (or 1763 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 36.

The square root of 5656509 is about 2378.3416491329. The cubic root of 5656509 is about 178.1761186618.

It can be divided in two parts, 56 and 56509, that added together give a palindrome (56565).

The spelling of 5656509 in words is "five million, six hundred fifty-six thousand, five hundred nine".