5636661 has 4 divisors (see below), whose sum is σ = 7515552. Its totient is φ = 3757772.

The previous prime is 5636651. The next prime is 5636669. The reversal of 5636661 is 1666365.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5636661 - 2⁵ = 5636629 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5636669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 939441 + ... + 939446.

It is an arithmetic number, because the mean of its divisors is an integer number (1878888).

Almost surely, 2^5636661 is an apocalyptic number.

It is an amenable number.

5636661 is a deficient number, since it is larger than the sum of its proper divisors (1878891).

5636661 is a wasteful number, since it uses less digits than its factorization.

5636661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1878890.

The product of its digits is 19440, while the sum is 33.

The square root of 5636661 is about 2374.1653270149. The cubic root of 5636661 is about 177.9674750150.

The spelling of 5636661 in words is "five million, six hundred thirty-six thousand, six hundred sixty-one".