204545155 has 4 divisors (see below), whose sum is σ = 245454192. Its totient is φ = 163636120.

The previous prime is 204545137. The next prime is 204545167. The reversal of 204545155 is 551545402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 204545155 - 2²³ = 196156547 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 20454511 + ... + 20454520.

It is an arithmetic number, because the mean of its divisors is an integer number (61363548).

Almost surely, 2^204545155 is an apocalyptic number.

204545155 is a deficient number, since it is larger than the sum of its proper divisors (40909037).

204545155 is an equidigital number, since it uses as much as digits as its factorization.

204545155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40909036.

The product of its (nonzero) digits is 20000, while the sum is 31.

The square root of 204545155 is about 14301.9283664826. The cubic root of 204545155 is about 589.2004442871.

The spelling of 204545155 in words is "two hundred four million, five hundred forty-five thousand, one hundred fifty-five".