204001551 has 16 divisors (see below), whose sum is σ = 325473120. Its totient is φ = 125539200.

The previous prime is 204001549. The next prime is 204001571. The reversal of 204001551 is 155100402.

It is not a de Polignac number, because 204001551 - 2¹ = 204001549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204001571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290250 + ... + 290951.

It is an arithmetic number, because the mean of its divisors is an integer number (20342070).

Almost surely, 2^204001551 is an apocalyptic number.

204001551 is a deficient number, since it is larger than the sum of its proper divisors (121471569).

204001551 is a wasteful number, since it uses less digits than its factorization.

204001551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581223 (or 581217 counting only the distinct ones).

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

The square root of 204001551 is about 14282.9111528428. The cubic root of 204001551 is about 588.6780235756.

Adding to 204001551 its reverse (155100402), we get a palindrome (359101953).

The spelling of 204001551 in words is "two hundred four million, one thousand, five hundred fifty-one".