806489881 has 2 divisors, whose sum is σ = 806489882. Its totient is φ = 806489880.

The previous prime is 806489869. The next prime is 806489891. The reversal of 806489881 is 188984608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 712089225 + 94400656 = 26685^2 + 9716^2 .

It is a cyclic number.

It is not a de Polignac number, because 806489881 - 2¹⁷ = 806358809 is a prime.

It is a super-2 number, since 2×806489881² = 1300851856310788322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (806489891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403244940 + 403244941.

It is an arithmetic number, because the mean of its divisors is an integer number (403244941).

Almost surely, 2^806489881 is an apocalyptic number.

It is an amenable number.

806489881 is a deficient number, since it is larger than the sum of its proper divisors (1).

806489881 is an equidigital number, since it uses as much as digits as its factorization.

806489881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 884736, while the sum is 52.

The square root of 806489881 is about 28398.7654837319. The cubic root of 806489881 is about 930.8212889920.

The spelling of 806489881 in words is "eight hundred six million, four hundred eighty-nine thousand, eight hundred eighty-one".