9887186081 has 2 divisors, whose sum is σ = 9887186082. Its totient is φ = 9887186080.

The previous prime is 9887186063. The next prime is 9887186083. The reversal of 9887186081 is 1806817889.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9256171681 + 631014400 = 96209^2 + 25120^2 .

It is a cyclic number.

It is not a de Polignac number, because 9887186081 - 2³⁰ = 8813444257 is a prime.

It is a super-2 number, since 2×9887186081² (a number of 21 digits) contains 22 as substring.

Together with 9887186083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9887186083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4943593040 + 4943593041.

It is an arithmetic number, because the mean of its divisors is an integer number (4943593041).

Almost surely, 2^9887186081 is an apocalyptic number.

It is an amenable number.

9887186081 is a deficient number, since it is larger than the sum of its proper divisors (1).

9887186081 is an equidigital number, since it uses as much as digits as its factorization.

9887186081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1548288, while the sum is 56.

The square root of 9887186081 is about 99434.3304950559. The cubic root of 9887186081 is about 2146.3023575660.

The spelling of 9887186081 in words is "nine billion, eight hundred eighty-seven million, one hundred eighty-six thousand, eighty-one".