6840542109 has 8 divisors (see below), whose sum is σ = 9121131040. Its totient is φ = 4560157296.

The previous prime is 6840542077. The next prime is 6840542113. The reversal of 6840542109 is 9012450486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6840542109 - 2⁵ = 6840542077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6840542509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64602 + ... + 133620.

It is an arithmetic number, because the mean of its divisors is an integer number (1140141380).

Almost surely, 2^6840542109 is an apocalyptic number.

It is an amenable number.

6840542109 is a deficient number, since it is larger than the sum of its proper divisors (2280588931).

6840542109 is a wasteful number, since it uses less digits than its factorization.

6840542109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102059.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 6840542109 is about 82707.5698409765. The cubic root of 6840542109 is about 1898.2941391676.

The spelling of 6840542109 in words is "six billion, eight hundred forty million, five hundred forty-two thousand, one hundred nine".