6787819121 has 4 divisors (see below), whose sum is σ = 6792537600. Its totient is φ = 6783100644.

The previous prime is 6787819097. The next prime is 6787819139. The reversal of 6787819121 is 1219187876.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6787819121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6787819121.

It is not an unprimeable number, because it can be changed into a prime (6787819321) 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, 2357081 + ... + 2359958.

It is an arithmetic number, because the mean of its divisors is an integer number (1698134400).

Almost surely, 2^6787819121 is an apocalyptic number.

It is an amenable number.

6787819121 is a deficient number, since it is larger than the sum of its proper divisors (4718479).

6787819121 is a wasteful number, since it uses less digits than its factorization.

6787819121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4718478.

The product of its digits is 338688, while the sum is 50.

The square root of 6787819121 is about 82388.2219798437. The cubic root of 6787819121 is about 1893.4045668877.

The spelling of 6787819121 in words is "six billion, seven hundred eighty-seven million, eight hundred nineteen thousand, one hundred twenty-one".