6853687549 has 2 divisors, whose sum is σ = 6853687550. Its totient is φ = 6853687548.

The previous prime is 6853687541. The next prime is 6853687579. The reversal of 6853687549 is 9457863586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5895475524 + 958212025 = 76782^2 + 30955^2 .

It is a cyclic number.

It is not a de Polignac number, because 6853687549 - 2³ = 6853687541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6853687541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3426843774 + 3426843775.

It is an arithmetic number, because the mean of its divisors is an integer number (3426843775).

Almost surely, 2^6853687549 is an apocalyptic number.

It is an amenable number.

6853687549 is a deficient number, since it is larger than the sum of its proper divisors (1).

6853687549 is an equidigital number, since it uses as much as digits as its factorization.

6853687549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43545600, while the sum is 61.

The square root of 6853687549 is about 82787.0010871272. The cubic root of 6853687549 is about 1899.5093422781.

The spelling of 6853687549 in words is "six billion, eight hundred fifty-three million, six hundred eighty-seven thousand, five hundred forty-nine".