478331809 has 2 divisors, whose sum is σ = 478331810. Its totient is φ = 478331808.

The previous prime is 478331797. The next prime is 478331863. The reversal of 478331809 is 908133874.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 477291409 + 1040400 = 21847^2 + 1020^2 .

It is a cyclic number.

It is not a de Polignac number, because 478331809 - 2¹⁹ = 477807521 is a prime.

It is not a weakly prime, because it can be changed into another prime (478331309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239165904 + 239165905.

It is an arithmetic number, because the mean of its divisors is an integer number (239165905).

Almost surely, 2^478331809 is an apocalyptic number.

It is an amenable number.

478331809 is a deficient number, since it is larger than the sum of its proper divisors (1).

478331809 is an equidigital number, since it uses as much as digits as its factorization.

478331809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 478331809 is about 21870.7980878614. The cubic root of 478331809 is about 782.0654272262.

The spelling of 478331809 in words is "four hundred seventy-eight million, three hundred thirty-one thousand, eight hundred nine".