806394581 has 2 divisors, whose sum is σ = 806394582. Its totient is φ = 806394580.

The previous prime is 806394577. The next prime is 806394607. The reversal of 806394581 is 185493608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 736253956 + 70140625 = 27134^2 + 8375^2 .

It is a cyclic number.

It is not a de Polignac number, because 806394581 - 2² = 806394577 is a prime.

It is a super-2 number, since 2×806394581² = 1300544440532331122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (806394521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403197290 + 403197291.

It is an arithmetic number, because the mean of its divisors is an integer number (403197291).

Almost surely, 2^806394581 is an apocalyptic number.

It is an amenable number.

806394581 is a deficient number, since it is larger than the sum of its proper divisors (1).

806394581 is an equidigital number, since it uses as much as digits as its factorization.

806394581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 806394581 is about 28397.0875443240. The cubic root of 806394581 is about 930.7846236164.

The spelling of 806394581 in words is "eight hundred six million, three hundred ninety-four thousand, five hundred eighty-one".