5665609 has 2 divisors, whose sum is σ = 5665610. Its totient is φ = 5665608.

The previous prime is 5665601. The next prime is 5665631. The reversal of 5665609 is 9065665.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5107600 + 558009 = 2260^2 + 747^2 .

It is a cyclic number.

It is not a de Polignac number, because 5665609 - 2³ = 5665601 is a prime.

It is not a weakly prime, because it can be changed into another prime (5665601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2832804 + 2832805.

It is an arithmetic number, because the mean of its divisors is an integer number (2832805).

Almost surely, 2^5665609 is an apocalyptic number.

It is an amenable number.

5665609 is a deficient number, since it is larger than the sum of its proper divisors (1).

5665609 is an equidigital number, since it uses as much as digits as its factorization.

5665609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 5665609 is about 2380.2539780452. The cubic root of 5665609 is about 178.2716153701.

The spelling of 5665609 in words is "five million, six hundred sixty-five thousand, six hundred nine".