204312617 has 2 divisors, whose sum is σ = 204312618. Its totient is φ = 204312616.

The previous prime is 204312601. The next prime is 204312623. The reversal of 204312617 is 716213402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122301481 + 82011136 = 11059^2 + 9056^2 .

It is a cyclic number.

It is not a de Polignac number, because 204312617 - 2⁴ = 204312601 is a prime.

It is not a weakly prime, because it can be changed into another prime (204312637) 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 as a sum of consecutive naturals, namely, 102156308 + 102156309.

It is an arithmetic number, because the mean of its divisors is an integer number (102156309).

Almost surely, 2^204312617 is an apocalyptic number.

It is an amenable number.

204312617 is a deficient number, since it is larger than the sum of its proper divisors (1).

204312617 is an equidigital number, since it uses as much as digits as its factorization.

204312617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 204312617 is about 14293.7964516079. The cubic root of 204312617 is about 588.9770813066.

The spelling of 204312617 in words is "two hundred four million, three hundred twelve thousand, six hundred seventeen".