204204204409 has 2 divisors, whose sum is σ = 204204204410. Its totient is φ = 204204204408.

The previous prime is 204204204359. The next prime is 204204204427. The reversal of 204204204409 is 904402402402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192120039225 + 12084165184 = 438315^2 + 109928^2 .

It is a cyclic number.

It is not a de Polignac number, because 204204204409 - 2²¹ = 204202107257 is a prime.

It is not a weakly prime, because it can be changed into another prime (204204204209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102102102204 + 102102102205.

It is an arithmetic number, because the mean of its divisors is an integer number (102102102205).

Almost surely, 2^204204204409 is an apocalyptic number.

It is an amenable number.

204204204409 is a deficient number, since it is larger than the sum of its proper divisors (1).

204204204409 is an equidigital number, since it uses as much as digits as its factorization.

204204204409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 31.

The spelling of 204204204409 in words is "two hundred four billion, two hundred four million, two hundred four thousand, four hundred nine".