9997180681 has 2 divisors, whose sum is σ = 9997180682. Its totient is φ = 9997180680.

The previous prime is 9997180679. The next prime is 9997180717. The reversal of 9997180681 is 1860817999.

9997180681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9270608656 + 726572025 = 96284^2 + 26955^2 .

It is an emirp because it is prime and its reverse (1860817999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9997180681 - 2¹ = 9997180679 is a prime.

It is a super-2 number, since 2×9997180681² (a number of 21 digits) contains 22 as substring.

Together with 9997180679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9997180481) 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, 4998590340 + 4998590341.

It is an arithmetic number, because the mean of its divisors is an integer number (4998590341).

Almost surely, 2^9997180681 is an apocalyptic number.

It is an amenable number.

9997180681 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997180681 is an equidigital number, since it uses as much as digits as its factorization.

9997180681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 58.

The square root of 9997180681 is about 99985.9024112900. The cubic root of 9997180681 is about 2154.2322030463.

The spelling of 9997180681 in words is "nine billion, nine hundred ninety-seven million, one hundred eighty thousand, six hundred eighty-one".