6542881349 has 4 divisors (see below), whose sum is σ = 6543083820. Its totient is φ = 6542678880.

The previous prime is 6542881343. The next prime is 6542881379. The reversal of 6542881349 is 9431882456.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6009040324 + 533841025 = 77518^2 + 23105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6542881349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6542881297 and 6542881306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6542881343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40694 + ... + 121415.

It is an arithmetic number, because the mean of its divisors is an integer number (1635770955).

Almost surely, 2^6542881349 is an apocalyptic number.

It is an amenable number.

6542881349 is a deficient number, since it is larger than the sum of its proper divisors (202471).

6542881349 is a wasteful number, since it uses less digits than its factorization.

6542881349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202470.

The product of its digits is 1658880, while the sum is 50.

The square root of 6542881349 is about 80888.0791526168. The cubic root of 6542881349 is about 1870.3505637866.

The spelling of 6542881349 in words is "six billion, five hundred forty-two million, eight hundred eighty-one thousand, three hundred forty-nine".