9806538881 has 2 divisors, whose sum is σ = 9806538882. Its totient is φ = 9806538880.

The previous prime is 9806538871. The next prime is 9806538899. The reversal of 9806538881 is 1888356089.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9502350400 + 304188481 = 97480^2 + 17441^2 .

It is an emirp because it is prime and its reverse (1888356089) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9806538881 - 2²² = 9802344577 is a prime.

It is a super-2 number, since 2×9806538881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9806538871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4903269440 + 4903269441.

It is an arithmetic number, because the mean of its divisors is an integer number (4903269441).

Almost surely, 2^9806538881 is an apocalyptic number.

It is an amenable number.

9806538881 is a deficient number, since it is larger than the sum of its proper divisors (1).

9806538881 is an equidigital number, since it uses as much as digits as its factorization.

9806538881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3317760, while the sum is 56.

The square root of 9806538881 is about 99027.9701952938. The cubic root of 9806538881 is about 2140.4508091084.

The spelling of 9806538881 in words is "nine billion, eight hundred six million, five hundred thirty-eight thousand, eight hundred eighty-one".