204001155 has 24 divisors (see below), whose sum is σ = 354034512. Its totient is φ = 108667584.

The previous prime is 204001153. The next prime is 204001163. The reversal of 204001155 is 551100402.

It is not a de Polignac number, because 204001155 - 2¹ = 204001153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204001153) 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 23 ways as a sum of consecutive naturals, for example, 42592 + ... + 47138.

It is an arithmetic number, because the mean of its divisors is an integer number (14751438).

Almost surely, 2^204001155 is an apocalyptic number.

204001155 is a deficient number, since it is larger than the sum of its proper divisors (150033357).

204001155 is a wasteful number, since it uses less digits than its factorization.

204001155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555 (or 5552 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 204001155 is about 14282.8972901159. The cubic root of 204001155 is about 588.6776426689.

Adding to 204001155 its reverse (551100402), we get a palindrome (755101557).

The spelling of 204001155 in words is "two hundred four million, one thousand, one hundred fifty-five".