204311123 has 16 divisors (see below), whose sum is σ = 218296320. Its totient is φ = 190675296.

The previous prime is 204311101. The next prime is 204311147. The reversal of 204311123 is 321113402.

It is a cyclic number.

It is not a de Polignac number, because 204311123 - 2¹⁸ = 204048979 is a prime.

It is a super-2 number, since 2×204311123² = 83486069963042258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (204611123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 547565 + ... + 547937.

It is an arithmetic number, because the mean of its divisors is an integer number (13643520).

Almost surely, 2^204311123 is an apocalyptic number.

204311123 is a deficient number, since it is larger than the sum of its proper divisors (13985197).

204311123 is a wasteful number, since it uses less digits than its factorization.

204311123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 204311123 is about 14293.7441910788. The cubic root of 204311123 is about 588.9756457060.

Adding to 204311123 its reverse (321113402), we get a palindrome (525424525).

It can be divided in two parts, 2043 and 11123, that multiplied together give a square (22724289 = 4767²).

The spelling of 204311123 in words is "two hundred four million, three hundred eleven thousand, one hundred twenty-three".