6979781 has 2 divisors, whose sum is σ = 6979782. Its totient is φ = 6979780.

The previous prime is 6979771. The next prime is 6979789. The reversal of 6979781 is 1879796.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6974881 + 4900 = 2641^2 + 70^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6979781 is a prime.

It is a super-2 number, since 2×6979781² = 97434685615922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6979789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3489890 + 3489891.

It is an arithmetic number, because the mean of its divisors is an integer number (3489891).

Almost surely, 2^6979781 is an apocalyptic number.

It is an amenable number.

6979781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6979781 is an equidigital number, since it uses as much as digits as its factorization.

6979781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 47.

The square root of 6979781 is about 2641.9275160382. The cubic root of 6979781 is about 191.1087618269.

The spelling of 6979781 in words is "six million, nine hundred seventy-nine thousand, seven hundred eighty-one".