204111 has 6 divisors (see below), whose sum is σ = 294840. Its totient is φ = 136068.

The previous prime is 204107. The next prime is 204133. The reversal of 204111 is 111402.

It is a happy number.

It is not a de Polignac number, because 204111 - 2² = 204107 is a prime.

It is a super-2 number, since 2×204111² = 83322600642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 22679 = 204111 / (2 + 0 + 4 + 1 + 1 + 1).

204111 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 204093 and 204102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204101) 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 5 ways as a sum of consecutive naturals, for example, 11331 + ... + 11348.

It is an arithmetic number, because the mean of its divisors is an integer number (49140).

2²⁰⁴¹¹¹ is an apocalyptic number.

204111 is a deficient number, since it is larger than the sum of its proper divisors (90729).

204111 is a wasteful number, since it uses less digits than its factorization.

204111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22685 (or 22682 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 204111 is about 451.7864539802. The cubic root of 204111 is about 58.8783282092.

Adding to 204111 its reverse (111402), we get a palindrome (315513).

The spelling of 204111 in words is "two hundred four thousand, one hundred eleven", and thus it is an iban number.