6810439381 has 2 divisors, whose sum is σ = 6810439382. Its totient is φ = 6810439380.

The previous prime is 6810439379. The next prime is 6810439387. The reversal of 6810439381 is 1839340186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5427268900 + 1383170481 = 73670^2 + 37191^2 .

It is a cyclic number.

It is not a de Polignac number, because 6810439381 - 2¹ = 6810439379 is a prime.

It is a super-2 number, since 2×6810439381² = 92764169124551326322, which contains 22 as substring.

Together with 6810439379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6810439387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3405219690 + 3405219691.

It is an arithmetic number, because the mean of its divisors is an integer number (3405219691).

Almost surely, 2^6810439381 is an apocalyptic number.

It is an amenable number.

6810439381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6810439381 is an equidigital number, since it uses as much as digits as its factorization.

6810439381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 6810439381 is about 82525.3862820405. The cubic root of 6810439381 is about 1895.5054780838.

The spelling of 6810439381 in words is "six billion, eight hundred ten million, four hundred thirty-nine thousand, three hundred eighty-one".