204145251 has 16 divisors (see below), whose sum is σ = 277430400. Its totient is φ = 133489088.

The previous prime is 204145237. The next prime is 204145259. The reversal of 204145251 is 152541402.

It is a cyclic number.

It is not a de Polignac number, because 204145251 - 2⁵ = 204145219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204145259) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 99700 + ... + 101726.

It is an arithmetic number, because the mean of its divisors is an integer number (17339400).

Almost surely, 2^204145251 is an apocalyptic number.

204145251 is a deficient number, since it is larger than the sum of its proper divisors (73285149).

204145251 is a wasteful number, since it uses less digits than its factorization.

204145251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2658.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 204145251 is about 14287.9407543565. The cubic root of 204145251 is about 588.8162139908.

Adding to 204145251 its reverse (152541402), we get a palindrome (356686653).

The spelling of 204145251 in words is "two hundred four million, one hundred forty-five thousand, two hundred fifty-one".