478211813 has 4 divisors (see below), whose sum is σ = 478918860. Its totient is φ = 477504768.

The previous prime is 478211801. The next prime is 478211821. The reversal of 478211813 is 318112874.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 398681089 + 79530724 = 19967^2 + 8918^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478211813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478211873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352508 + ... + 353861.

It is an arithmetic number, because the mean of its divisors is an integer number (119729715).

Almost surely, 2^478211813 is an apocalyptic number.

It is an amenable number.

478211813 is a deficient number, since it is larger than the sum of its proper divisors (707047).

478211813 is an equidigital number, since it uses as much as digits as its factorization.

478211813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707046.

The product of its digits is 10752, while the sum is 35.

The square root of 478211813 is about 21868.0546231255. The cubic root of 478211813 is about 782.0000245289. Note that the first 4 decimals are identical.

The spelling of 478211813 in words is "four hundred seventy-eight million, two hundred eleven thousand, eight hundred thirteen".