481806821 has 2 divisors, whose sum is σ = 481806822. Its totient is φ = 481806820.

The previous prime is 481806811. The next prime is 481806827. The reversal of 481806821 is 128608184.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 481144225 + 662596 = 21935^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 481806821 - 2²² = 477612517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (481806827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 240903410 + 240903411.

It is an arithmetic number, because the mean of its divisors is an integer number (240903411).

Almost surely, 2^481806821 is an apocalyptic number.

It is an amenable number.

481806821 is a deficient number, since it is larger than the sum of its proper divisors (1).

481806821 is an equidigital number, since it uses as much as digits as its factorization.

481806821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24576, while the sum is 38.

The square root of 481806821 is about 21950.0984280253. The cubic root of 481806821 is about 783.9547238231.

The spelling of 481806821 in words is "four hundred eighty-one million, eight hundred six thousand, eight hundred twenty-one".