478836521 has 2 divisors, whose sum is σ = 478836522. Its totient is φ = 478836520.

The previous prime is 478836511. The next prime is 478836529. The reversal of 478836521 is 125638874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 360810025 + 118026496 = 18995^2 + 10864^2 .

It is a cyclic number.

It is not a de Polignac number, because 478836521 - 2¹⁸ = 478574377 is a prime.

It is not a weakly prime, because it can be changed into another prime (478836529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239418260 + 239418261.

It is an arithmetic number, because the mean of its divisors is an integer number (239418261).

Almost surely, 2^478836521 is an apocalyptic number.

It is an amenable number.

478836521 is a deficient number, since it is larger than the sum of its proper divisors (1).

478836521 is an equidigital number, since it uses as much as digits as its factorization.

478836521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 44.

The square root of 478836521 is about 21882.3335364398. Note that the first 3 decimals coincide. The cubic root of 478836521 is about 782.3403960873.

The spelling of 478836521 in words is "four hundred seventy-eight million, eight hundred thirty-six thousand, five hundred twenty-one".