809897000081 has 16 divisors (see below), whose sum is σ = 958019341440. Its totient is φ = 677456524800.

The previous prime is 809897000053. The next prime is 809897000083. The reversal of 809897000081 is 180000798908.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809897000081 is a prime.

It is a super-2 number, since 2×809897000081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 809896999993 and 809897000029.

It is not an unprimeable number, because it can be changed into a prime (809897000083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71275520 + ... + 71286881.

It is an arithmetic number, because the mean of its divisors is an integer number (59876208840).

Almost surely, 2^809897000081 is an apocalyptic number.

It is an amenable number.

809897000081 is a deficient number, since it is larger than the sum of its proper divisors (148122341359).

809897000081 is a wasteful number, since it uses less digits than its factorization.

809897000081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142562456.

The product of its (nonzero) digits is 290304, while the sum is 50.

Adding to 809897000081 its reverse (180000798908), we get a palindrome (989897798989).

The spelling of 809897000081 in words is "eight hundred nine billion, eight hundred ninety-seven million, eighty-one", and thus it is an aban number.