843346727981 has 2 divisors, whose sum is σ = 843346727982. Its totient is φ = 843346727980.

The previous prime is 843346727957. The next prime is 843346727987. The reversal of 843346727981 is 189727643348.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 843199591081 + 147136900 = 918259^2 + 12130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-843346727981 is a prime.

It is a super-2 number, since 2×843346727981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (843346727987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421673363990 + 421673363991.

It is an arithmetic number, because the mean of its divisors is an integer number (421673363991).

Almost surely, 2^843346727981 is an apocalyptic number.

It is an amenable number.

843346727981 is a deficient number, since it is larger than the sum of its proper divisors (1).

843346727981 is an equidigital number, since it uses as much as digits as its factorization.

843346727981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48771072, while the sum is 62.

The spelling of 843346727981 in words is "eight hundred forty-three billion, three hundred forty-six million, seven hundred twenty-seven thousand, nine hundred eighty-one".