5656581 has 24 divisors (see below), whose sum is σ = 9632960. Its totient is φ = 3213648.

The previous prime is 5656577. The next prime is 5656603. The reversal of 5656581 is 1856565.

It is not a de Polignac number, because 5656581 - 2² = 5656577 is a prime.

It is a super-2 number, since 2×5656581² = 63993817219122, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5656181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32611 + ... + 32783.

Almost surely, 2^5656581 is an apocalyptic number.

It is an amenable number.

5656581 is a deficient number, since it is larger than the sum of its proper divisors (3976379).

5656581 is an equidigital number, since it uses as much as digits as its factorization.

5656581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362 (or 183 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 5656581 is about 2378.3567856821. The cubic root of 5656581 is about 178.1768746420.

The spelling of 5656581 in words is "five million, six hundred fifty-six thousand, five hundred eighty-one".