683841649 has 2 divisors, whose sum is σ = 683841650. Its totient is φ = 683841648.

The previous prime is 683841629. The next prime is 683841689. The reversal of 683841649 is 946148386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 537915249 + 145926400 = 23193^2 + 12080^2 .

It is a cyclic number.

It is not a de Polignac number, because 683841649 - 2¹¹ = 683839601 is a prime.

It is not a weakly prime, because it can be changed into another prime (683841629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341920824 + 341920825.

It is an arithmetic number, because the mean of its divisors is an integer number (341920825).

Almost surely, 2^683841649 is an apocalyptic number.

It is an amenable number.

683841649 is a deficient number, since it is larger than the sum of its proper divisors (1).

683841649 is an equidigital number, since it uses as much as digits as its factorization.

683841649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 49.

The square root of 683841649 is about 26150.3661351041. The cubic root of 683841649 is about 881.0188135642.

The spelling of 683841649 in words is "six hundred eighty-three million, eight hundred forty-one thousand, six hundred forty-nine".