204145317 has 12 divisors (see below), whose sum is σ = 302846700. Its totient is φ = 132418368.

The previous prime is 204145313. The next prime is 204145321. The reversal of 204145317 is 713541402.

204145317 is a `hidden beast` number, since 204 + 1 + 453 + 1 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (204145313) and next prime (204145321).

It can be written as a sum of positive squares in 2 ways, for example, as 169676676 + 34468641 = 13026^2 + 5871^2 .

It is not a de Polignac number, because 204145317 - 2² = 204145313 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204145313) 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 11 ways as a sum of consecutive naturals, for example, 306192 + ... + 306857.

It is an arithmetic number, because the mean of its divisors is an integer number (25237225).

Almost surely, 2^204145317 is an apocalyptic number.

It is an amenable number.

204145317 is a deficient number, since it is larger than the sum of its proper divisors (98701383).

204145317 is a wasteful number, since it uses less digits than its factorization.

204145317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613092 (or 613089 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 204145317 is about 14287.9430639963. The cubic root of 204145317 is about 588.8162774454.

Adding to 204145317 its reverse (713541402), we get a palindrome (917686719).

The spelling of 204145317 in words is "two hundred four million, one hundred forty-five thousand, three hundred seventeen".