481218809 has 4 divisors (see below), whose sum is σ = 489375120. Its totient is φ = 473062500.

The previous prime is 481218769. The next prime is 481218821. The reversal of 481218809 is 908812184.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 481218809 - 2⁸ = 481218553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (481218709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4078067 + ... + 4078184.

It is an arithmetic number, because the mean of its divisors is an integer number (122343780).

Almost surely, 2^481218809 is an apocalyptic number.

It is an amenable number.

481218809 is a deficient number, since it is larger than the sum of its proper divisors (8156311).

481218809 is an equidigital number, since it uses as much as digits as its factorization.

481218809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8156310.

The product of its (nonzero) digits is 36864, while the sum is 41.

The square root of 481218809 is about 21936.7000480929. The cubic root of 481218809 is about 783.6356731016.

The spelling of 481218809 in words is "four hundred eighty-one million, two hundred eighteen thousand, eight hundred nine".