9817795081 has 4 divisors (see below), whose sum is σ = 10083140932. Its totient is φ = 9552449232.

The previous prime is 9817795067. The next prime is 9817795087. The reversal of 9817795081 is 1805977189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1805977189 = 19 ⋅95051431.

It can be written as a sum of positive squares in 2 ways, for example, as 8760960000 + 1056835081 = 93600^2 + 32509^2 .

It is a cyclic number.

It is not a de Polignac number, because 9817795081 - 2³¹ = 7670311433 is a prime.

It is a super-2 number, since 2×9817795081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9817795087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132672870 + ... + 132672943.

It is an arithmetic number, because the mean of its divisors is an integer number (2520785233).

Almost surely, 2^9817795081 is an apocalyptic number.

It is an amenable number.

9817795081 is a deficient number, since it is larger than the sum of its proper divisors (265345851).

9817795081 is a wasteful number, since it uses less digits than its factorization.

9817795081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265345850.

The product of its (nonzero) digits is 1270080, while the sum is 55.

The square root of 9817795081 is about 99084.7873338789. The cubic root of 9817795081 is about 2141.2694509773.

The spelling of 9817795081 in words is "nine billion, eight hundred seventeen million, seven hundred ninety-five thousand, eighty-one".