204109517 has 2 divisors, whose sum is σ = 204109518. Its totient is φ = 204109516.

The previous prime is 204109489. The next prime is 204109541. The reversal of 204109517 is 715901402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134119561 + 69989956 = 11581^2 + 8366^2 .

It is a cyclic number.

It is not a de Polignac number, because 204109517 - 2¹⁰ = 204108493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204109517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204109117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102054758 + 102054759.

It is an arithmetic number, because the mean of its divisors is an integer number (102054759).

Almost surely, 2^204109517 is an apocalyptic number.

It is an amenable number.

204109517 is a deficient number, since it is larger than the sum of its proper divisors (1).

204109517 is an equidigital number, since it uses as much as digits as its factorization.

204109517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 204109517 is about 14286.6902045225. The cubic root of 204109517 is about 588.7818561234.

It can be divided in two parts, 2041095 and 17, that multiplied together give a triangular number (34698615 = T₈₃₃₀).

The spelling of 204109517 in words is "two hundred four million, one hundred nine thousand, five hundred seventeen".