201605223 has 4 divisors (see below), whose sum is σ = 268806968. Its totient is φ = 134403480.

The previous prime is 201605213. The next prime is 201605249. The reversal of 201605223 is 322506102.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 201605223 - 2⁴ = 201605207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201605223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201605213) 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, 33600868 + ... + 33600873.

It is an arithmetic number, because the mean of its divisors is an integer number (67201742).

Almost surely, 2^201605223 is an apocalyptic number.

201605223 is a deficient number, since it is larger than the sum of its proper divisors (67201745).

201605223 is an equidigital number, since it uses as much as digits as its factorization.

201605223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67201744.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 201605223 is about 14198.7754049425. The cubic root of 201605223 is about 586.3639472517.

The spelling of 201605223 in words is "two hundred one million, six hundred five thousand, two hundred twenty-three".