843708385109 has 2 divisors, whose sum is σ = 843708385110. Its totient is φ = 843708385108.

The previous prime is 843708385057. The next prime is 843708385127. The reversal of 843708385109 is 901583807348.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 786884314225 + 56824070884 = 887065^2 + 238378^2 .

It is a cyclic number.

It is not a de Polignac number, because 843708385109 - 2¹² = 843708381013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (843708385199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421854192554 + 421854192555.

It is an arithmetic number, because the mean of its divisors is an integer number (421854192555).

Almost surely, 2^843708385109 is an apocalyptic number.

It is an amenable number.

843708385109 is a deficient number, since it is larger than the sum of its proper divisors (1).

843708385109 is an equidigital number, since it uses as much as digits as its factorization.

843708385109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 843708385109 in words is "eight hundred forty-three billion, seven hundred eight million, three hundred eighty-five thousand, one hundred nine".