478915909 has 2 divisors, whose sum is σ = 478915910. Its totient is φ = 478915908.

The previous prime is 478915903. The next prime is 478915937. The reversal of 478915909 is 909519874.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 433555684 + 45360225 = 20822^2 + 6735^2 .

It is a cyclic number.

It is not a de Polignac number, because 478915909 - 2¹⁷ = 478784837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478915903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239457954 + 239457955.

It is an arithmetic number, because the mean of its divisors is an integer number (239457955).

Almost surely, 2^478915909 is an apocalyptic number.

It is an amenable number.

478915909 is a deficient number, since it is larger than the sum of its proper divisors (1).

478915909 is an equidigital number, since it uses as much as digits as its factorization.

478915909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 478915909 is about 21884.1474359866. The cubic root of 478915909 is about 782.3836293584.

The spelling of 478915909 in words is "four hundred seventy-eight million, nine hundred fifteen thousand, nine hundred nine".