806494831621 has 2 divisors, whose sum is σ = 806494831622. Its totient is φ = 806494831620.

The previous prime is 806494831613. The next prime is 806494831651. The reversal of 806494831621 is 126138494608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 615887496225 + 190607335396 = 784785^2 + 436586^2 .

It is a cyclic number.

It is not a de Polignac number, because 806494831621 - 2³ = 806494831613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (806494831651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403247415810 + 403247415811.

It is an arithmetic number, because the mean of its divisors is an integer number (403247415811).

Almost surely, 2^806494831621 is an apocalyptic number.

It is an amenable number.

806494831621 is a deficient number, since it is larger than the sum of its proper divisors (1).

806494831621 is an equidigital number, since it uses as much as digits as its factorization.

806494831621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1990656, while the sum is 52.

The spelling of 806494831621 in words is "eight hundred six billion, four hundred ninety-four million, eight hundred thirty-one thousand, six hundred twenty-one".