5565581 has 4 divisors (see below), whose sum is σ = 6360672. Its totient is φ = 4770492.

The previous prime is 5565551. The next prime is 5565607. The reversal of 5565581 is 1855655.

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 an emirpimes, since its reverse is a distinct semiprime: 1855655 = 5 ⋅371131.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5565581 is a prime.

It is a super-2 number, since 2×5565581² = 61951383735122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5565551) 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, 397535 + ... + 397548.

It is an arithmetic number, because the mean of its divisors is an integer number (1590168).

Almost surely, 2^5565581 is an apocalyptic number.

It is an amenable number.

5565581 is a deficient number, since it is larger than the sum of its proper divisors (795091).

5565581 is an equidigital number, since it uses as much as digits as its factorization.

5565581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795090.

The product of its digits is 30000, while the sum is 35.

The square root of 5565581 is about 2359.1483632871. The cubic root of 5565581 is about 177.2162337547.

The spelling of 5565581 in words is "five million, five hundred sixty-five thousand, five hundred eighty-one".