1605211223 has 16 divisors (see below), whose sum is σ = 2006484480. Its totient is φ = 1247575200.

The previous prime is 1605211189. The next prime is 1605211229. The reversal of 1605211223 is 3221125061.

It is a cyclic number.

It is not a de Polignac number, because 1605211223 - 2¹⁴ = 1605194839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605211229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3158 + ... + 56748.

It is an arithmetic number, because the mean of its divisors is an integer number (125405280).

Almost surely, 2^1605211223 is an apocalyptic number.

1605211223 is a deficient number, since it is larger than the sum of its proper divisors (401273257).

1605211223 is a wasteful number, since it uses less digits than its factorization.

1605211223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53998.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1605211223 is about 40065.0873329886. The cubic root of 1605211223 is about 1170.8755282196.

Adding to 1605211223 its reverse (3221125061), we get a palindrome (4826336284).

The spelling of 1605211223 in words is "one billion, six hundred five million, two hundred eleven thousand, two hundred twenty-three".