806479021 has 2 divisors, whose sum is σ = 806479022. Its totient is φ = 806479020.

The previous prime is 806479007. The next prime is 806479103. The reversal of 806479021 is 120974608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 805764996 + 714025 = 28386^2 + 845^2 .

It is a cyclic number.

It is not a de Polignac number, because 806479021 - 2¹¹ = 806476973 is a prime.

It is a super-2 number, since 2×806479021² = 1300816822626236882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (806479001) 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 as a sum of consecutive naturals, namely, 403239510 + 403239511.

It is an arithmetic number, because the mean of its divisors is an integer number (403239511).

Almost surely, 2^806479021 is an apocalyptic number.

It is an amenable number.

806479021 is a deficient number, since it is larger than the sum of its proper divisors (1).

806479021 is an equidigital number, since it uses as much as digits as its factorization.

806479021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 806479021 is about 28398.5742775936. The cubic root of 806479021 is about 930.8171109009.

The spelling of 806479021 in words is "eight hundred six million, four hundred seventy-nine thousand, twenty-one".