5665631 has 2 divisors, whose sum is σ = 5665632. Its totient is φ = 5665630.

The previous prime is 5665609. The next prime is 5665661. The reversal of 5665631 is 1365665.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5665631 - 2¹⁸ = 5403487 is a prime.

It is a super-2 number, since 2×5665631² = 64198749256322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

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, 2832815 + 2832816.

It is an arithmetic number, because the mean of its divisors is an integer number (2832816).

Almost surely, 2^5665631 is an apocalyptic number.

5665631 is a deficient number, since it is larger than the sum of its proper divisors (1).

5665631 is an equidigital number, since it uses as much as digits as its factorization.

5665631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 32.

The square root of 5665631 is about 2380.2585993963. The cubic root of 5665631 is about 178.2718461173.

The spelling of 5665631 in words is "five million, six hundred sixty-five thousand, six hundred thirty-one".