204145313 has 2 divisors, whose sum is σ = 204145314. Its totient is φ = 204145312.

The previous prime is 204145301. The next prime is 204145321. The reversal of 204145313 is 313541402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201299344 + 2845969 = 14188^2 + 1687^2 .

It is a cyclic number.

It is not a de Polignac number, because 204145313 - 2²² = 199951009 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (204145213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102072656 + 102072657.

It is an arithmetic number, because the mean of its divisors is an integer number (102072657).

Almost surely, 2^204145313 is an apocalyptic number.

It is an amenable number.

204145313 is a deficient number, since it is larger than the sum of its proper divisors (1).

204145313 is an equidigital number, since it uses as much as digits as its factorization.

204145313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 204145313 is about 14287.9429240181. The cubic root of 204145313 is about 588.8162735997.

Adding to 204145313 its reverse (313541402), we get a palindrome (517686715).

The spelling of 204145313 in words is "two hundred four million, one hundred forty-five thousand, three hundred thirteen".