809846881 has 2 divisors, whose sum is σ = 809846882. Its totient is φ = 809846880.

The previous prime is 809846819. The next prime is 809846893. The reversal of 809846881 is 188648908.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 626000400 + 183846481 = 25020^2 + 13559^2 .

It is a cyclic number.

It is not a de Polignac number, because 809846881 - 2⁷ = 809846753 is a prime.

It is a super-2 number, since 2×809846881² = 1311703941330856322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (809846581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404923440 + 404923441.

It is an arithmetic number, because the mean of its divisors is an integer number (404923441).

Almost surely, 2^809846881 is an apocalyptic number.

It is an amenable number.

809846881 is a deficient number, since it is larger than the sum of its proper divisors (1).

809846881 is an equidigital number, since it uses as much as digits as its factorization.

809846881 is an evil number, because the sum of its binary digits is even.

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

The square root of 809846881 is about 28457.8087877475. The cubic root of 809846881 is about 932.1110102656. Note that the first 3 decimals are identical.

The spelling of 809846881 in words is "eight hundred nine million, eight hundred forty-six thousand, eight hundred eighty-one".