6781420931 has 2 divisors, whose sum is σ = 6781420932. Its totient is φ = 6781420930.

The previous prime is 6781420889. The next prime is 6781420973. The reversal of 6781420931 is 1390241876.

It is a balanced prime because it is at equal distance from previous prime (6781420889) and next prime (6781420973).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6781420931 is a prime.

It is a super-2 number, since 2×6781420931² = 91975339686809813522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6781420981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3390710465 + 3390710466.

It is an arithmetic number, because the mean of its divisors is an integer number (3390710466).

Almost surely, 2^6781420931 is an apocalyptic number.

6781420931 is a deficient number, since it is larger than the sum of its proper divisors (1).

6781420931 is an equidigital number, since it uses as much as digits as its factorization.

6781420931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 6781420931 is about 82349.3833067376. The cubic root of 6781420931 is about 1892.8094729273.

The spelling of 6781420931 in words is "six billion, seven hundred eighty-one million, four hundred twenty thousand, nine hundred thirty-one".