223581 has 4 divisors (see below), whose sum is σ = 298112. Its totient is φ = 149052.

The previous prime is 223577. The next prime is 223589. The reversal of 223581 is 185322.

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 not a de Polignac number, because 223581 - 2² = 223577 is a prime.

It is a super-2 number, since 2×223581² = 99976927122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223589) 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, 37261 + ... + 37266.

It is an arithmetic number, because the mean of its divisors is an integer number (74528).

2²²³⁵⁸¹ is an apocalyptic number.

It is an amenable number.

223581 is a deficient number, since it is larger than the sum of its proper divisors (74531).

223581 is an equidigital number, since it uses as much as digits as its factorization.

223581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74530.

The product of its digits is 480, while the sum is 21.

The square root of 223581 is about 472.8435259153. The cubic root of 223581 is about 60.6938888150.

The spelling of 223581 in words is "two hundred twenty-three thousand, five hundred eighty-one".