223665581 has 4 divisors (see below), whose sum is σ = 224275392. Its totient is φ = 223055772.

The previous prime is 223665571. The next prime is 223665599. The reversal of 223665581 is 185566322.

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 223665581 - 2⁶ = 223665517 is a prime.

It is a super-2 number, since 2×223665581² = 100052584248135122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223665551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304355 + ... + 305088.

It is an arithmetic number, because the mean of its divisors is an integer number (56068848).

Almost surely, 2^223665581 is an apocalyptic number.

It is an amenable number.

223665581 is a deficient number, since it is larger than the sum of its proper divisors (609811).

223665581 is an equidigital number, since it uses as much as digits as its factorization.

223665581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609810.

The product of its digits is 86400, while the sum is 38.

The square root of 223665581 is about 14955.4532194782. The cubic root of 223665581 is about 607.0154137726.

The spelling of 223665581 in words is "two hundred twenty-three million, six hundred sixty-five thousand, five hundred eighty-one".