204013609 has 2 divisors, whose sum is σ = 204013610. Its totient is φ = 204013608.

The previous prime is 204013603. The next prime is 204013613. The reversal of 204013609 is 906310402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198387225 + 5626384 = 14085^2 + 2372^2 .

It is a cyclic number.

It is not a de Polignac number, because 204013609 - 2⁵ = 204013577 is a prime.

It is not a weakly prime, because it can be changed into another prime (204013603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102006804 + 102006805.

It is an arithmetic number, because the mean of its divisors is an integer number (102006805).

Almost surely, 2^204013609 is an apocalyptic number.

It is an amenable number.

204013609 is a deficient number, since it is larger than the sum of its proper divisors (1).

204013609 is an equidigital number, since it uses as much as digits as its factorization.

204013609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 204013609 is about 14283.3332594321. Note that the first 3 decimals coincide. The cubic root of 204013609 is about 588.6896217550.

The spelling of 204013609 in words is "two hundred four million, thirteen thousand, six hundred nine".