9187063681 has 2 divisors, whose sum is σ = 9187063682. Its totient is φ = 9187063680.

The previous prime is 9187063591. The next prime is 9187063733. The reversal of 9187063681 is 1863607819.

9187063681 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8971120656 + 215943025 = 94716^2 + 14695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9187063681 is a prime.

It is a super-2 number, since 2×9187063681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9187763681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4593531840 + 4593531841.

It is an arithmetic number, because the mean of its divisors is an integer number (4593531841).

Almost surely, 2^9187063681 is an apocalyptic number.

It is an amenable number.

9187063681 is a deficient number, since it is larger than the sum of its proper divisors (1).

9187063681 is an equidigital number, since it uses as much as digits as its factorization.

9187063681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 9187063681 is about 95849.1715196329. The cubic root of 9187063681 is about 2094.3965263618.

It can be divided in two parts, 91870 and 63681, that added together give a palindrome (155551).

The spelling of 9187063681 in words is "nine billion, one hundred eighty-seven million, sixty-three thousand, six hundred eighty-one".