204055551 has 48 divisors (see below), whose sum is σ = 355816800. Its totient is φ = 115226496.

The previous prime is 204055549. The next prime is 204055559. The reversal of 204055551 is 155550402.

204055551 is a `hidden beast` number, since 20 + 40 + 55 + 551 = 666.

It is not a de Polignac number, because 204055551 - 2¹ = 204055549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204055559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 116881 + ... + 118613.

It is an arithmetic number, because the mean of its divisors is an integer number (7412850).

Almost surely, 2^204055551 is an apocalyptic number.

204055551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

204055551 is a deficient number, since it is larger than the sum of its proper divisors (151761249).

204055551 is a wasteful number, since it uses less digits than its factorization.

204055551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845 (or 1832 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 204055551 is about 14284.8013986894. The cubic root of 204055551 is about 588.7299607768.

The spelling of 204055551 in words is "two hundred four million, fifty-five thousand, five hundred fifty-one".