204209947 has 2 divisors, whose sum is σ = 204209948. Its totient is φ = 204209946.

The previous prime is 204209917. The next prime is 204209969. The reversal of 204209947 is 749902402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204209947 - 2¹⁹ = 203685659 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (204209917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102104973 + 102104974.

It is an arithmetic number, because the mean of its divisors is an integer number (102104974).

Almost surely, 2^204209947 is an apocalyptic number.

204209947 is a deficient number, since it is larger than the sum of its proper divisors (1).

204209947 is an equidigital number, since it uses as much as digits as its factorization.

204209947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 204209947 is about 14290.2045821605. The cubic root of 204209947 is about 588.8784083192.

The spelling of 204209947 in words is "two hundred four million, two hundred nine thousand, nine hundred forty-seven".