3568661 has 4 divisors (see below), whose sum is σ = 3573024. Its totient is φ = 3564300.

The previous prime is 3568651. The next prime is 3568679. The reversal of 3568661 is 1668653.

3568661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3568661 - 2⁶ = 3568597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3568651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545 + ... + 2726.

It is an arithmetic number, because the mean of its divisors is an integer number (893256).

It is a Poulet number, since it divides 2^3568660-1.

Almost surely, 2^3568661 is an apocalyptic number.

3568661 is the 1091-st octagonal number.

It is an amenable number.

3568661 is a deficient number, since it is larger than the sum of its proper divisors (4363).

3568661 is a wasteful number, since it uses less digits than its factorization.

3568661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4362.

The product of its digits is 25920, while the sum is 35.

The square root of 3568661 is about 1889.0899925626. The cubic root of 3568661 is about 152.8158606061.

The spelling of 3568661 in words is "three million, five hundred sixty-eight thousand, six hundred sixty-one".