993281168861 has 2 divisors, whose sum is σ = 993281168862. Its totient is φ = 993281168860.

The previous prime is 993281168851. The next prime is 993281168863. The reversal of 993281168861 is 168861182399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 749793200836 + 243487968025 = 865906^2 + 493445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-993281168861 is a prime.

Together with 993281168863, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 993281168794 and 993281168803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (993281168863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496640584430 + 496640584431.

It is an arithmetic number, because the mean of its divisors is an integer number (496640584431).

Almost surely, 2^993281168861 is an apocalyptic number.

It is an amenable number.

993281168861 is a deficient number, since it is larger than the sum of its proper divisors (1).

993281168861 is an equidigital number, since it uses as much as digits as its factorization.

993281168861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8957952, while the sum is 62.

The spelling of 993281168861 in words is "nine hundred ninety-three billion, two hundred eighty-one million, one hundred sixty-eight thousand, eight hundred sixty-one".