6817719109 has 2 divisors, whose sum is σ = 6817719110. Its totient is φ = 6817719108.

The previous prime is 6817719089. The next prime is 6817719119. The reversal of 6817719109 is 9019177186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5377288900 + 1440430209 = 73330^2 + 37953^2 .

It is a cyclic number.

It is not a de Polignac number, because 6817719109 - 2¹³ = 6817710917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6817719119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3408859554 + 3408859555.

It is an arithmetic number, because the mean of its divisors is an integer number (3408859555).

Almost surely, 2^6817719109 is an apocalyptic number.

It is an amenable number.

6817719109 is a deficient number, since it is larger than the sum of its proper divisors (1).

6817719109 is an equidigital number, since it uses as much as digits as its factorization.

6817719109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 49.

The square root of 6817719109 is about 82569.4804937030. The cubic root of 6817719109 is about 1896.1806107693.

The spelling of 6817719109 in words is "six billion, eight hundred seventeen million, seven hundred nineteen thousand, one hundred nine".