809797481 has 2 divisors, whose sum is σ = 809797482. Its totient is φ = 809797480.

The previous prime is 809797463. The next prime is 809797511. The reversal of 809797481 is 184797908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 576960400 + 232837081 = 24020^2 + 15259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809797481 is a prime.

It is a super-2 number, since 2×809797481² = 1311543920467890722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (809797381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404898740 + 404898741.

It is an arithmetic number, because the mean of its divisors is an integer number (404898741).

Almost surely, 2^809797481 is an apocalyptic number.

It is an amenable number.

809797481 is a deficient number, since it is larger than the sum of its proper divisors (1).

809797481 is an equidigital number, since it uses as much as digits as its factorization.

809797481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The square root of 809797481 is about 28456.9408229346. The cubic root of 809797481 is about 932.0920572094.

The spelling of 809797481 in words is "eight hundred nine million, seven hundred ninety-seven thousand, four hundred eighty-one".