478818521 has 4 divisors (see below), whose sum is σ = 478866432. Its totient is φ = 478770612.

The previous prime is 478818427. The next prime is 478818523. The reversal of 478818521 is 125818874.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 478818521 - 2²⁶ = 411709657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478818523) 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 in 3 ways as a sum of consecutive naturals, for example, 2645 + ... + 31058.

It is an arithmetic number, because the mean of its divisors is an integer number (119716608).

Almost surely, 2^478818521 is an apocalyptic number.

It is an amenable number.

478818521 is a deficient number, since it is larger than the sum of its proper divisors (47911).

478818521 is a wasteful number, since it uses less digits than its factorization.

478818521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47910.

The product of its digits is 143360, while the sum is 44.

The square root of 478818521 is about 21881.9222418873. The cubic root of 478818521 is about 782.3305929479.

The spelling of 478818521 in words is "four hundred seventy-eight million, eight hundred eighteen thousand, five hundred twenty-one".