204155601 has 32 divisors (see below), whose sum is σ = 314834688. Its totient is φ = 116551680.

The previous prime is 204155599. The next prime is 204155641. The reversal of 204155601 is 106551402.

It is not a de Polignac number, because 204155601 - 2¹ = 204155599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204155641) 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 31 ways as a sum of consecutive naturals, for example, 44905 + ... + 49241.

It is an arithmetic number, because the mean of its divisors is an integer number (9838584).

Almost surely, 2^204155601 is an apocalyptic number.

It is an amenable number.

204155601 is a deficient number, since it is larger than the sum of its proper divisors (110679087).

204155601 is a wasteful number, since it uses less digits than its factorization.

204155601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4441.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 204155601 is about 14288.3029433170. The cubic root of 204155601 is about 588.8261646588.

The spelling of 204155601 in words is "two hundred four million, one hundred fifty-five thousand, six hundred one".