204547979 has 2 divisors, whose sum is σ = 204547980. Its totient is φ = 204547978.

The previous prime is 204547969. The next prime is 204547997. The reversal of 204547979 is 979745402.

Together with next prime (204547997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204547979 - 2⁴ = 204547963 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (204547909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102273989 + 102273990.

It is an arithmetic number, because the mean of its divisors is an integer number (102273990).

Almost surely, 2^204547979 is an apocalyptic number.

204547979 is a deficient number, since it is larger than the sum of its proper divisors (1).

204547979 is an equidigital number, since it uses as much as digits as its factorization.

204547979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 47.

The square root of 204547979 is about 14302.0270940870. The cubic root of 204547979 is about 589.2031558227.

The spelling of 204547979 in words is "two hundred four million, five hundred forty-seven thousand, nine hundred seventy-nine".