6917218549 has 2 divisors, whose sum is σ = 6917218550. Its totient is φ = 6917218548.

The previous prime is 6917218547. The next prime is 6917218577. The reversal of 6917218549 is 9458127196.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4358376324 + 2558842225 = 66018^2 + 50585^2 .

It is a cyclic number.

It is not a de Polignac number, because 6917218549 - 2¹ = 6917218547 is a prime.

Together with 6917218547, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 6917218496 and 6917218505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6917218547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3458609274 + 3458609275.

It is an arithmetic number, because the mean of its divisors is an integer number (3458609275).

Almost surely, 2^6917218549 is an apocalyptic number.

It is an amenable number.

6917218549 is a deficient number, since it is larger than the sum of its proper divisors (1).

6917218549 is an equidigital number, since it uses as much as digits as its factorization.

6917218549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 52.

The square root of 6917218549 is about 83169.8175361711. The cubic root of 6917218549 is about 1905.3605358724.

The spelling of 6917218549 in words is "six billion, nine hundred seventeen million, two hundred eighteen thousand, five hundred forty-nine".