683116781 has 2 divisors, whose sum is σ = 683116782. Its totient is φ = 683116780.

The previous prime is 683116771. The next prime is 683116799. The reversal of 683116781 is 187611386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 667395556 + 15721225 = 25834^2 + 3965^2 .

It is a cyclic number.

It is not a de Polignac number, because 683116781 - 2⁶ = 683116717 is a prime.

It is a super-2 number, since 2×683116781² = 933297072967603922, 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 (683116711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341558390 + 341558391.

It is an arithmetic number, because the mean of its divisors is an integer number (341558391).

Almost surely, 2^683116781 is an apocalyptic number.

It is an amenable number.

683116781 is a deficient number, since it is larger than the sum of its proper divisors (1).

683116781 is an equidigital number, since it uses as much as digits as its factorization.

683116781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 683116781 is about 26136.5028456372. The cubic root of 683116781 is about 880.7074119776.

The spelling of 683116781 in words is "six hundred eighty-three million, one hundred sixteen thousand, seven hundred eighty-one".