6918507109 has 2 divisors, whose sum is σ = 6918507110. Its totient is φ = 6918507108.

The previous prime is 6918507103. The next prime is 6918507131. The reversal of 6918507109 is 9017058196.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5257700100 + 1660807009 = 72510^2 + 40753^2 .

It is a cyclic number.

It is not a de Polignac number, because 6918507109 - 2²⁵ = 6884952677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6918507103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3459253554 + 3459253555.

It is an arithmetic number, because the mean of its divisors is an integer number (3459253555).

Almost surely, 2^6918507109 is an apocalyptic number.

It is an amenable number.

6918507109 is a deficient number, since it is larger than the sum of its proper divisors (1).

6918507109 is an equidigital number, since it uses as much as digits as its factorization.

6918507109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 6918507109 is about 83177.5637356613. The cubic root of 6918507109 is about 1905.4788405984.

The spelling of 6918507109 in words is "six billion, nine hundred eighteen million, five hundred seven thousand, one hundred nine".